篇一：江苏省徐州市2016年中考英语试题(含答案)
徐州市2016年初中毕业、升学考试
英 语 试 题
一、选择填空 （共15小题，每小题1分，满分15分）
从A、B、C、D四个选项中选出可以填入空白处的最佳选项。
1. — _______ you play tennis?
—Yes, and I’m a good player.
A. Can B. MayC. MustD. Should
2. It’s not cool but it isn’t as _________ as yesterday.
A. hot B. hotterC. hottest D. the hottest
3. Have you read the Harry Potter series __________ J.K. Rowling?
A. of B. for C. with D. by
4. I love __________. I hope one day I can take part in one of them , answer all the questions and win a big prize!
A. chat shows B. game shows C. cartoonsD. documentaries
5. —Is your friend British or American?
— __________. She is Canadian.
A. BothB. EitherC. Neither D. None
6. If someone is in your way, you should say “___________” and be polite enough to wait till he or she moves.
A. excuse meB. I’m sorryC. thank youD. never mind
7. My cousin works for an airline. He flies planes. He is __________.
A. an inventor B. a scientistC. an explorer D. a pilot
8. When you are home, give me a call to let me know you __________ safely.
A. arrived B. have arrived C. will arriveD. are arriving
9. Anita spoke _________ quietly that o could hardly hear her.
A. too B. such C. soD. very
10. I will see what I can do, but I can’t _________ you anything.
A. plan B. prepareC. promise D. protect
11. The teacher encourages the children to feel _________ about asking questions when they don’t understand.
A. nervousB. confident C. excited D. practical
12. We should save energy by _________ the lights when we leave a room.
A. getting off B. showing off C. taking offD. turning off
13. I went to work the next day, __________ I was still feeling unwell.
A. becauseB. until C. unlessD. though
14. David said that the glass was broken and warned me __________ it.
A. don’t touchB. to not touch C. not to touch D. no touching
15. Which of the following sentences is a FACT?
A. Xuzhou is in Jiangsu Province.B. Xuzhou is a beautiful place to go.
C. Life in Xuzhou is getting better. C. People in Xuzhou are friendly.
二、完形填
根据短文内容，从各题所给的A、B、C、D四个选项中选出最佳选项。
Kevin sat at the desk in his study, pencil in hand. He had to write a story for his English
class by Friday. “I don’,” he complained to his dog, who was asleep at his feet. Kevin was talkative when speaking to his friends, yet he had finding words he had to write.
By bedtime Kevin had drawn a picture of his dog smiling. He had drawn a tree with its
branches(树枝asking his friend to go to the movies on Saturday.
On Wednesday, Mrs Scott, Kevin’s English teacher, asked the class to the first draft() of their stories. Kevin had to turn in the only work that he had—the page with his name, the Kevin wasn’t when Mrs Scott asked him to stay after class the next day. But
“Kevin, this is a fantastic story—the dog, the movie, the tree in the I can’t wait to find out how they all fit together. I think you have the idea of a story there. Look at your note and the pictures and try to see a story comes to you.”
That night Kevin sat at his desk, and this was what he wrote: “One Saturday Tom went to
meet his friend at the . it looked as if it might rain, so his umbrella. Suddenly a big storm blew in. The noise of the wind like Tom’s dog Spotty. Spotty really hated storms and barked whenever he wanted to be let inside. Then Tom saw Spotty running after him down the busy street, barking. The sound was full of blame(责备). Tom felt 29 because he had left Spotty outside. He turned and headed home with Spotty. Tom let Spotty in the door just and the rain started to pour down.”
top of the page.
16. A. talk about B. worry aboutC. write aboutD. care about
17. A. trouble B. fun C. helpD. experience
18. A. report B. notice C. letter D. note
19. A. And B. ButC. So D. Or
20. A. hand in B. hand outC. take in D. take out
21. A. photos B. maps C. writingsD. drawings
22. A. cheerful B. surprised C. scared D. satisfied
23. A. I B. youC. he D. she
24. A. windB. rain C. snow D. fog
25. A. whenB. whyC. if D. where
26. A. theatre B. cinema C. bank D. museum
27. A. carried B. lost C. soldD. hid
28. A. looked B. felt C. soundedD. acted
29. A. energeticB. angry C. guilty D. curious
30. A. smoothlyB. proudlyC. hurriedlyD. properly
三、阅读理解 （共12小题，每小题2分，满分24分）
阅读下列短文，从各题所给的A、B、C、D四个选项中选出最佳选项。
Mrs White had a problem. Her young son, Timmy, hated to go to bed at night. Mrs White read to him and gave him warm milk, but Timmy refused to fall asleep. No matter what she did, Timmy wanted to stay up. One day Mrs White had an idea.
Ever since Uncle Charlie had taken him sailing, Timmy wanted to be a sailor. He loved
fishing with his father. He loved to watch the waves wash against his hair. “some day,” Timmy said, “I’m going to have my own boat. And I’m going to be the captain.”
So Mrs White had a boat built—one that could be hung from the ceiling in her son’s bedroom. She felt that if he could sleep in the boat, he would want to go to bed at night.
The boat builder made the boat and hung it in Timmy’s bedroom. Timmy loved it.
Finally Timmy was happy to go to bed.
31.Who once took Timmy sailing?
A. Mrs. White. B. Mr. White. C. Uncle Charlie. D. The boat builder.
32. One of Timmy’s dreams was to be ____________.
A. a captain B. a story—teller C. a fisherman D. an engineer
33. Mrs. White had a boat built for Timmy to _________.
A. go fishing in B. play withC. go sailing inD. sleep in
34. Which sentence is the most suitable to be put in the last paragraph?
A. But Mrs. White disliked it.B. And Mrs. White loved it too.
C. But Mrs. White doubted it.D. And Mrs. White couldn’t fall asleep.
B
35. What is NOT included? A. When to have the party. B. Where to have the party. C. What colour to wear at the party. D. What activities to do at the party.
36. What never grows in one’s life?
A. Eyes B. Nose C. Ears D. Hair
37. What is this passage mainly about?
A. A lucky camel’s story.
B. John’s unusual experience.
C. How John got home from work.
D. A camel running away from the zoo.
38. What is the best title for this passage?
A. How insects communicate with each
other
B. How insects communicate with
willow trees
C. How willow trees communicate with
each other
D. How willow trees send out a special
smell
William Shakespeare is one of the greatest writers in English
literature. His plays can be divided into three histories,
tragedies(悲剧) and comedies. Shakespeare wrote eighteen comedies,
although two were lost. These comedies usually have happy endings and
a light-hearted tone and style that are quite different from his tragedies.
All of Shakespeare’s comedies have five acts and the most important or exciting point always takes place in the third act. The hero does not appear until after other characters have talked about him. Shakespeare had some themes that he usually wrote about: the fight between good and bad, love’s great effect on people, and the difference between first appearance and a person’s true personality or face. Shakespeare also wrote his play in a certain style. For example, Shakespeare used words in such a clever and humorous way that they had more than one meaning. Some of the characters changed their appearances so that people didn’t know who they were.
Even though the tone is lighter in these plays. Comedies in Shakespeare’s day were quite different from modern-day comedies because their purpose was not to make people laugh. Shakespeare’s comedies are very emotional(有感染力的) and often include serious topics to think about.
39. How many Shakespeare’s comedies can people enjoy now?
A. 18 B. 16 C. 5 D. 2
40. Which word has the same meaning as the underlined word “categories” in Paragraph 1?
A. typeB. partsC. copiesD. pages
41. When does the hero in Shakespeare’s comedies appear?
A. At the beginning of the play.B. In the middle of the play.
C. Near the end of the play. D. Not until other characters have mentioned him.
42. Which sentence is WRONG according to the passage?
A. All Shakespeare’s comedies have five acts.
B. Shakespeare’s plays are written in a certain style.
C. The purpose of Shakespeare’s comedies is to make people laugh.
D. The fight between good and bad is one of the themes Shakespeare wrote about.
四、词语运用 （共16小题，每小题1分，满分16分）
A）选出方框内的单词或词组填空，其中有一个单词或词组是多余的。
43. It’s important for students to read Englishevery day.
44. my home.
45. I’m glad you me of the meeting. I had completely forgotten it.
46. The Great Wall of China was first built over 2,000 years ago. It is one of the of the
world.
47. Let’s donate money to ORBIS for doctors to with their work.
B）根据句子意思，用括号中所给单词的真确形式填空。（每空限填一个单词）
48. 49. Sandy came first in the race. She ran the (fast) of all.
50. (serve).
51. (comfortable) feeling that I did it wrong.
52. I’m not (worry) about my younger sister-she can take care of herself.
C）用括号中所给动词的正确形式填空，使短文完整。
Dr Watson was a good friend of the famous detective Sherlock Holmes. One morning theybreakfast when suddenly Holmes said, “I have to go to a place (call) Coland. A horse has disappeared from there, and the police can’t find it. Will you come with me?”
“Do you think that the horse(steal) the other day?” Watson asked.
“I don’t know,’ Holmes replied. “ I need to go to Coland
“Why is this horse so important, Holmes?” Watson asked.
“Because I (run) in a big race. If it wins, a lot of people will win a great deal (not want) it to win.”
An hour later, they were on the train to Coland. 五、阅读填词。（共10小题，每小题1分，满分10分）
阅读短文，根据所读内容在文章后表格中的空格里填入一个最恰当的单词。 ．．
Brazil is a country in South America. It will host the 2016 Olympic Games.
Brazilians are very friendly people and are generally relaxed, so it is important to say hello and goodbye to everyone. Women kiss men and each other, but men usually just shake hands.
篇二：2016年江苏省徐州市中考数学试卷
2016年江苏省徐州市中考数学试卷
一、选择题：本大题共8小题，每小题3分，共24分
1．（3分）（2016?徐州）﹣的相反数是（ ）
A．4 B．﹣4 C． D．﹣
2．（3分）（2016?徐州）下列运算中，正确的是（ ）
236392723623A．x+x=x B．x+x=x C．（x）=x D．x÷x=x
3．（3分）（2016?徐州）下列事件中的不可能事件是（ ）
A．通常加热到100℃时，水沸腾
B．抛掷2枚正方体骰子，都是6点朝上
C．经过有交通信号灯的路口，遇到红灯
D．任意画一个三角形，其内角和是360°
4．（3分）（2016?徐州）下列图形中，不可以作为一个正方体的展开图的是（ ）
A． B． C． D．
5．（3分）（2016?徐州）下列图案中，是轴对称图形但不是中心对称图形的是（ ）
A． B． C． D．
A．中位数是22 B．平均数是26 C．众数是22 D．极差是15
7．（3分）（2016?徐州）函数y=中自变量x的取值范围是（ ）
A．x≤2 B．x≥2 C．x＜2 D．x≠2
8．（3分）（2016?徐州）如图是由三个边长分别为6、9、x的正方形所组成的图形，若直线AB将它分成面积相等的两部分，则x的值是（ ）
A．1或9 B．3或5 C．4或6 D．3或6
二、填空题：本大题共10小题，每小题3分，共30分
9．（3分）（2016?徐州）9的平方根是______．
10．（3分）（2016?徐州）某市2016年中考考生约为61500人，该人数用科学记数法表示为______．
11．（3分）（2016?徐州）若反比例函数的图象过点（3，﹣2），则其函数表达式为______．
12．（3分）（2016?徐州）若二次函数y=x+2x+m的图象与x轴没有公共点，则m的取值范围是______．
13．（3分）（2016?徐州）如图，△ABC中，D、E分别为AB、AC的中点，则△ADE与△ABC的面积比为______．
2
14．（3分）（2016?徐州）若等腰三角形的顶角为120°，腰长为2cm，则它的底边长为______cm．
15．（3分）（2016?徐州）如图，⊙O是△ABC的内切圆，若∠ABC=70°，∠ACB=40°，则∠BOC=______°．
16．（3分）（2016?徐州）用一个半径为10的半圆，围成一个圆锥的侧面，该圆锥的底面圆的半径为______．
17．（3分）（2016?徐州）如图，每个图案都由大小相同的正方形组成，按照此规律，第n个图案中这样的正方形的总个数可用含n的代数式表示为______．
18．（3分）（2016?徐州）如图，正方形ABCD的边长为2，点E，F分别在边AD，CD上，若∠EBF=45°，则△EDF的周长等于______．
三、解答题：本大题共10小题，共86分
19．（10分）（2016?徐州）计算：
（1）（﹣1）2016+x﹣0+
（2）÷．
20．（10分）（2016?徐州）（1）解方程：+1=；
（2）解不等式组：．
21．（7分）（2016?徐州）某校随机抽取部分学生，就“学习习惯”进行调查，将“对自己做错的题目进行整理、分析、改正”（选项为：很少、有时、常常、总是）的调查数据进行了整理，绘制成部分统计图如下：
请根据图中信息，解答下列问题
（1）该调查的样本容量为______，a=______%，b=______%，“常常”对应扇形的圆心角为______°
（2）请你补全条形统计图；
（3）若该校共有3200名学生，请你估计其中“总是”对错题进行整理、分析、改正的学生有多少名？
22．（7分）（2016?徐州）某乳品公司最近推出一款果味酸奶，共有红枣、木瓜两种口味，若送奶员连续三天，每天从中任选一瓶某种口味的酸奶赠送给某住户品尝，则该住户收到的三瓶酸奶中，至少有两瓶为红枣口味的概率是多少？
（请用“画树状图”的方法给出分析过程，并求出结果）
23．（8分）（2016?徐州）如图，在△ABC中，∠ABC=90°，∠BAC=60°，△ACD是等边三角形，E是AC的中点，连接BE并延长，交DC于点F，求证：
（1）△ABE≌△CFE；
（2）四边形ABFD是平行四边形．
24．（8分）（2016?徐州）小丽购买学习用品的收据如表，因污损导致部分数据无法识别，根据下表，解决下列问题：
（1）小丽买了自动铅笔、记号笔各几支？
（2）若小丽再次购买软皮笔记本和自动铅笔两种文具，共花费15元，则有哪几种不同的购
C，测得旗杆顶部A的仰角为45°，在C、B之间选择一点D（C、D、B三点共线），测得旗杆顶部A的仰角为75°，且CD=8m
（1）求点D到CA的距离；
（2）求旗杆AB的高．
（注：结果保留根号）
26．（8分）（2016?徐州）某宾馆拥有客房100
间，经营中发现：每天入住的客房数y（间）
（2）已知每间入住的客房，宾馆每日需支出各种费用100元；每日空置的客房需支出各种费用60元，当房价为多少元时，宾馆当日利润最大？求出最大值．（宾馆当日利润=当日房费收入﹣当日支出）
27．（9分）（2016?徐州）如图，将边长为6的正方形纸片ABCD对折，使AB与DC重合，折痕为EF，展平后，再将点B折到边CD上，使边AB经过点E，折痕为GH，点B的对应点为M，点A的对应点为N
（1）若CM=x，则CH=______（用含x的代数式表示）；
（2）求折痕GH的长．
228．（11分）（2016?徐州）如图，在平面直角坐标系中，二次函数y=ax+bx+c的图象经过点
A（﹣1，0），B（0，﹣），C（2，0），其对称轴与x轴交于点D
（1）求二次函数的表达式及其顶点坐标；
（2）若P为y轴上的一个动点，连接PD，则PB+PD的最小值为______；
（3）M（x，t）为抛物线对称轴上一动点
①若平面内存在点N，使得以A，B，M，N为顶点的四边形为菱形，则这样的点N共有______个；
②连接MA，MB，若∠AMB不小于60°，求t的取值范围．
篇三：2016年江苏省徐州市中考数学试卷(解析版)
2016年徐州中考数学试卷
一、选择题（本大题共有8小题，每小题3分，共24分）
1．?1的相反数是 （ ）
4
A．4 B．-4 C．1 D．?1 44
【考点】相反数．
【分析】根据相反数的定义：只有符号不同的两个数叫互为相反数．即a的相反数是-a．
【解答】解：?1的相反数是-（?1）=1． 444
故选C．
【点评】主要考查相反数的概念：只有符号不同的两个数互为相反数，0的相反数是0．
2．（2016?徐州）下列运算中，正确的是（ ）
A．x+x=x?? B．x2x=x? C．（x）=x?D．x÷x=x
【考点】整式的混合运算．
【专题】计算题．
【分析】原式各项计算得到结果，即可做出判断．
【解答】解：（1）x+x=2x，错误；（2）x2x=x，错误；（3）（x）=x，错误；（4）x÷x=x，正确．
故选D．
【点评】此题考查了整式的混合运算，熟练掌握运算法则是解本题的关键．
3．（2016?徐州）下列事件中的不可能事件是（ ）
A．通常加热到100℃时，水沸腾
B．抛掷2枚正方体骰子，都是6点朝上
C．经过有交通信号灯的路口，遇到红灯
D．任意画一个三角形，其内角和是360°
【考点】随机事件．
【分析】不可能事件就是一定不会发生的事件，据此即可判断．
【解答】解：A、是必然事件，选项错误；
B、是随机事件，选项错误；
C、是随机事件，选项错误；
D、是不可能事件，选项正确．
故选D．
【点评】本题考查了必然事件、不可能事件、随机事件的概念．必然事件指在一定条件下一定发生的事件．不可能事件是指在一定条件下，一定不发生的事件．不确定事件即随机事件是指在一定条件下，可能发生也可能不发生的事件．
4．（2016?徐州）下列图形中，不可以作为一个正方体的展开图的是（ ） 3333692362-133636272352-1
A． B． C． D．
【考点】几何体的展开图．
【分析】利用不能出现同一行有多于4个正方形的情况，不能出现田字形、凹字形的情况进行判断也可．
【解答】A．可以作为一个正方体的展开图，
B．可以作为一个正方体的展开图，
C．不可以作为一个正方体的展开图，
D．可以作为一个正方体的展开图，
故选；C．
【点评】本题考查了正方体的展开图，熟记展开图的11种形式是解题的关键，利用不是正方体展开图的“一线不过四、田凹应弃之”（即不能出现同一行有多于4个正方形的情况，不能出现田字形、凹字形的情况）判断也可．
5．（2016?徐州）下列图案中，是轴对称的图形但不是中心对称的图形的是（ ）
【考点】中心对称图形；轴对称图形．
【分析】根据轴对称图形和中心对称图形的概念以及等边三角形、平行四边形、矩形、圆的性质解答．
【解答】解：A、是轴对称图形，也是中心对称图形，不合题意；
B、是轴对称但不是中心对称图形，符合题意；
C、既是轴对称又是中心对称图形，不合题意；
D、只是中心对称图形，不合题意．
故选B．
【点评】掌握好中心对称图形与轴对称图形的概念：
轴对称图形的关键是寻找对称轴，两边图象折叠后可重合，中心对称图形是要寻找对称中心，旋转180度后重合．
6．（2016?徐州）某人一周内爬楼的层数统计如表
关于这组数据，下列说法错误的是（ ）
A．中位数是22 B．平均数是26 C．众数是22D．极差是15
【考点】极差；算术平均数；中位数；众数．
【分析】根据表格中的数据，求出中位数，平均数，众数，极差，即可做出判断．
【解答】解：这个人一周内爬楼的层数按从小到大的顺序排列为21，22，22，24，26，31，36，
中位数为24；
平均数为（21+22+22+24+26+31+36）÷7=26；
众数为22；
极差为36-21=15；
所以B、C、D正确，A错误．
故选A．
【点评】此题考查了极差，平均数，中位数，众数，熟练掌握各自的求法是解本题的关键．
7．（2016?徐州）函数y?2-x中自变量x的取值范围是（）
A.2≤x B.2≥xC.2＜xD.2≠x
【考点】函数自变量的取值范围；二次根式有意义的条件．
【分析】根据二次根式的性质，被开方数大于等于0可知：2-x≥0，解得x的范围．
【解答】解：根据题意得：2-x≥0，
解得x≤2．
故选B．
【点评】本题考查的是函数自变量取值范围的求法．函数自变量的范围一般从三个方面考虑：
（1）当函数表达式是整式时，自变量可取全体实数；
（2）当函数表达式是分式时，考虑分式的分母不能为0；
（3）当函数表达式是二次根式时，被开方数为非负数．
8．（2016?徐州）如图是由三个边长分别为6、9、x的正方形所组成的图形，若直线AB将它分成面积相等的两部分，则x的值是（）
A．1或9 B．3或5 C．4或6 D．3或
6
【考点】正方形的性质．
【分析】根据题意列方程，即可得到结论．
【解答】解：如图，
∵若直线AB将它分成面积相等的两部分， 222∴13（6+9+x）39-x?（9-x）=13（6+9+x），
22
解得x=3，或x=6，
故选D．
【点评】本题考查了正方形的性质，图形的面积的计算，准确分识别图形是解题的关键．
9．（2016?徐州）9的平方根是 _______．
【考点】算术平方根；平方根．
【分析】根据平方根的定义解答．
【解答】解：9的平方根是±3．
故答案为：±3．
【点评】本题考查了平方根的定义，熟记概念是解题的关键．
10．（2016?徐州）某市2016年中考考生约为61500人，该人数用科学记数法表示为 _______．
【考点】科学记数法—表示较大的数．
【分析】根据科学记数法的表示方法进行解答即可．
【解答】解：61500=6.15310．
故答案为：6.15310．
【点评】本题考查的是科学记数法，熟知把一个大于10的数记成a310的形式，其中a是整数数位只有一位的数，n是正整数，这种记数法叫做科学记数法是解答此题的关键．
11．（2016?徐州）若反比例函数的图像过（3，-2），则奇函数表达式为 ____________．
【考点】待定系数法求反比例函数解析式．
【分析】先设y?k，再把已知点的坐标代入可求出k值，即得到反比例函数的解析式． n44x
【解答】解：设函数解析式为y?k，把点（-2，3）代入函数y?k,得k=-6． xx
即函数关系式是y??6． x
故答案为：y??6． x
12．（2016?徐州）若二次函数y=x+2x+m的图像与x轴没有公共点，则m的取值范围是 __________．
【考点】抛物线与x轴的交点．
【分析】由题意可得二次方程无实根，得出判别式小于0，解不等式即可得到所求范围． 2
【解答】解：∵二次函数y=x+2x+m的图象与x轴没有公共点，
∴方程x+2x+m=0没有实数根，
∴判别式△=2-4313m＜0，
解得：m＞1；
故答案为：m＞1．
【点评】本题考查二次函数的图象与x轴的交点、根的判别式；根据题意得出不等式是解决问题的关键．
13．（2016?徐州）如图，△ABC中，D、E分别为AB、AC的中点，则△ADE与△ABC的面积比为 _______．
222
【考点】相似三角形的判定与性质；三角形中位线定理．
【分析】根据三角形的中位线得出DE=1BC，DE∥BC，推出△ADE∽△ABC，根据相似三角形的性质得出即可．
2
【解答】解：∵D、E分别为AB、AC的中点，
∴DE=1BC，DE∥BC，
2
∴△ADE∽△ABC， ∴S?ADE?(DE)2?1，
S?ABCBC4
故答案为：1：4．
【点评】本题考查了三角形的性质和判定，三角形的中位线的应用，注意：相似三角形的面积比等于相似比的平方．
14．（2016?徐州）若等腰三角形的顶角为120°，腰长为2cm，则它的底边长为 _______cm．
【考点】等腰三角形的性质；三角形三边关系．
【分析】作AD⊥BC于点D，可得BC=2BD，RT△ABD中，根据BD=ABcos∠B求得BD，即可得答案．
【解答】解：如图，作AD⊥BC于点D，
∵∠BAC=120°，AB=AC，
∴∠B=30°，
又∵AD⊥BC，
∴BC=2BD，
∵AB=2cm，
∴在RT△ABD中，BD=ABcos∠B=23?（cm），
2
∴BC=2cm， 故答案为：23．
【点评】本题主要考查等腰三角形的性质及解直角三角形，熟练掌握等腰三角形的性质：①等腰三角形的两腰相等，②等腰三角形的两个底角相等． ③等腰三角形的顶角平分线、底边上的中线、底边上的高相互重合是解题关键．
15．（2016?徐州）如图，⊙O是△ABC的内切圆，若∠ABC=70°，∠ACB=40°，则∠BOC=° _______．
【考点】三角形的内切圆与内心；圆周角定理．
【分析】根据三角形内心的性质得到OB平分∠ABC，OC平分∠ACB，根据角平分线定义得∠OBC=1∠ABC=35°，∠OCB=1∠ACB=20°，
22
然后根据三角形内角和定理计算∠BOC．
【解答】解：∵⊙O是△ABC的内切圆，
∴OB平分∠ABC，OC平分∠ACB，
∴∠OBC=1∠ABC=35°，∠OCB=1∠ACB=20°，
22
∴∠BOC=180°-∠OBC-∠OCB=180°-35°-20°=125°．
故答案为125．
【点评】本题考查了三角形的内切圆与内心：与三角形各边都相切的圆叫三角形的内切圆，三角形的内切圆的圆心叫做三角形的内心，这个三角形叫做圆的外切三角形．三角形的内心就是三角形三个内角角平分线的交点．
16．（2016?徐州）用一个半径为10的半圆，围成一个圆锥的侧面，该圆锥的底面圆的半径为 __________．
【考点】圆锥的计算．
【分析】设圆锥的底面圆的半径为r，根据半圆的弧长等于圆锥底面周长，列出方程求解即可．
【解答】解：∵半径为10的半圆的弧长为：132π310=10π
2
∴围成的圆锥的底面圆的周长为10π
设圆锥的底面圆的半径为r，则
2πr=10π
解得r=5
故答案为：5
【点评】本题主要考查了圆锥的计算，需要掌握弧长计算公式以及圆周长计算公式．解答此类试题时注意：锥的侧面展开图为一扇形，这个扇形的弧长等于圆锥底面的周长，扇形的半径等于圆锥的母线长．
17．（2016?徐州）如图，每个图案都由大小相同的正方形组成，按照此规律，第n个图案中这样的正方形的总个数可用含n的代数式表示为 _______．
【考点】规律型：图形的变化类．
【分析】设第n个图案中正方形的总个数为an，根据给定图案写出部分an的值，根据数据的变化找出变换规律“an=n（n+1）”，由此即可得出结论．
【解答】解：设第n个图案中正方形的总个数为an，
观察，发现规律：a1=2，a2=2+4=6，a3=2+4+6=12，?，