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八下勾股定理卷(文末附下载链接)

八下勾股定理卷(文末附下载链接)

🤜《几何模型180题初中版》微店链接

🤜《初中几何模型》拼多多链接

🤜七下考点视频讲义

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🤜七上七下讲义合订本

🤜八上八下讲义合订本

🤜九上九下讲义合订本

🤜中考总复习刷题手册

🤜函数压轴必刷111题

一、选择题

1.如图,带阴影的长方形面积是(  )

A.9cm2B.24cm2

C.45cm2D.51cm2

2.下列命题是真命题的是(  )

A.如果一个数的相反数等于这个数本身,那么这个数一定是0

B.如果一个数的倒数等于这个数本身,那么这个数一定是1

C.如果一个数的平方等于这个数本身,那么这个数一定是0

D.如果一个数的算术平方根等于这个数本身,那么这个数一定是0

3.如图,矩形纸片ABCD中,点EAD的中点,且AE=1,BE的垂直平分线MN恰好过点C.则矩形的一边AB的长度为(  )

A.1B.C.D.2

4.如图,已知Rt△ABC中,∠ACB=90°.AC=3,BC=4.以ABBCAC为直径作半圆围成两月形,则阴影部分的面积为(  )

A.5B.6C.7D.8

5.已知在△ABC中,AB=8,BC=15,AC=17,则下列结论错误的是(  )

A.△ABC是直角三角形,且∠B=90°

B.△ABC是直角三角形,且∠A=60°

C.△ABC是直角三角形,且AC是它的斜边

D.△ABC的面积为60

6.下列命题的逆命题是真命题的是(  )

A.若ab,则|a|=|b|

B.全等三角形的周长相等

C.若a=0,则ab=0

D.有两边相等的三角形是等腰三角形

7.三角形的三边a,b,c满足(a+b2c2=2ab,则此三角形是(  )

A.锐角三角形B.直角三角形

C.钝角三角形D.等边三角形

8.如图,在平面直角坐标系中,A(4,0),B(0,3),以点A为圆心,AB长为半径画弧,交x轴的负半轴于点C,则点C坐标为(  )

A.(1,0)B.(﹣5,0)

C.(0,1)D.(﹣1,0)

二、填空题

9.《九章算术》是我国古代最重要的数学著作之一,在“勾股”章中记载了一道“折竹抵地”问题:“今有竹高一丈,末折抵地,去本三尺,问折者高几何?”翻译成数学问题是:如图,在△ABC中,∠ACB=90°,AC+AB=10,BC=3,则AC的长为 

10.命题:“直角三角形中,30°的锐角所对的直角边等于斜边的一半”的逆命题是 

11.如图,Rt△ABC的两直角边分别为1,2,以Rt△ABC的斜边AC为一直角边,另一直角边为1画第二个△ACD;在以△ACD的斜边AD为一直角边,另一直角边长为1画第三个△ADE;…,依此类推,第n个直角三角形的斜边长是

12.如图,长方体的底面边长分别为1cm和3cm,高为6cm.如果用一根细线从点A开始经过4个侧面缠绕一圈到达点B,那么所用细线最短需要 

三、解答题

13.(10分)若a,b,c是△ABC的三边长,且a,b,c满足(a﹣5)2+(b﹣12)2+|c﹣13|=0.

(1)求a,b,c的值;

(2)△ABC是直角三角形吗?请说明理由.

14.(10分)根据规定,小汽车在城市街道上行驶的速度不得超过70km/h.如图,一辆小汽车在一条城市街道上直行,某一时刻刚好行驶到路边车速检测仪A处的正前方30mC处,过了2s后,测得小汽车与车速检测仪间的距离为50m.这辆小汽车超速了吗?

15.(10分)如图所示,在正方形ABCD中,MAB的中点,NAD上的一点,且ANAD,试猜测△CMN是什么三角形,请证明你的结论.(提示:正方形的四条边都相等,四个角都是直角)

16.(12分)勾股定理是一条古老的数学定理,它有很多种证明方法,我国汉代数学家赵爽根据弦图,利用面积法进行证明,著名数学家华罗庚曾提出把“数形关系”(勾股定理)带到其他星球,作为地球人与其他星球“人”进行第一次“谈话”的语言.

(1)请你根据图1中的直角三角形叙述勾股定理(用文字及符号语言叙述).

(2)以图1中的直角三角形为基础,可以构造出以a,b为底,以a+b为高的直角梯形(如图2),请你利用图2,验证勾股定理.

(3)利用图2中的直角梯形中线段BCAD的大小关系,可以证明.请完成其证明.

17.(14分)能构成为直角三角形三边长的三个正整数a,b,c称为勾股数,世界上第一次给出勾股数公式的是我国古代数学著作《九章算术》,其勾股数的公式为:,其中mn>0,m,n是互质的奇数.

(1)当m=5,n=3时,求这个三角形的面积.

(2)当m=5+t,n=5﹣t时,计算三角形的周长(用含t的代数式表示),并直接写出符合条件的三角形的周长值.

🤜《几何模型180题初中版》微店链接

🤜《初中几何模型》拼多多链接

🤜七下考点视频讲义

🤜八下考点视频讲义

🤜九下考点视频讲义

🤜七上七下讲义合订本

🤜八上八下讲义合订本

🤜九上九下讲义合订本

🤜中考总复习刷题手册

🤜函数压轴必刷111题

答案

一、选择题

题号

1

2

3

4

5

6

7

8

答案

C

A

C

B

B

D

B

D

二、填空题

9.4.55.

10.直角三角形中,如果有一条直角边等于斜边的一半,那么这条直角边所对的角等于30°.

11.

12.解:将长方体展开,如图,连接AB′,

AA′=1+3+1+3=8(cm),AB′=6cm,

∴根据两点之间线段最短,AB′==10cm

三、解答题

13.解:(1)由题意得a﹣5=0,b﹣12=0,c﹣13=0,

所以a=5,b=12,c=13.

(2)△ABC是直角三角形,

理由:因为a2+b2=52+122=25+144=169,c2=132=169,

所以a2+b2c2,

所以△ABC是直角三角形.

14.解:在Rt△ABC中,AC=30m,AB=50m

根据勾股定理可得:

BC=40(m),

∴小汽车的速度为v=20(m/s)=20×3.6(km/h)=72(km/h);

∵72(km/h)>70(km/h);

∴这辆小汽车超速行驶.

答:这辆小汽车超速了.

15.解:△CMN是直角三角形.理由如下:

设正方形ABCD的边长为4a,则ABBCCDAD=4a

MAB的中点,

AMBM=2a

ANAD,AD=4a,

ANa,DN=3a

∵在Rt△AMN中,满足AM2+AN2MN2,且AM=2a,ANa,

MNa

同理可得:MCa,NC=5a

MN2+MC2=(a2+(a2=25a2,NC2=(5a2=25a2,

MN2+MC2NC2,

∴△CMN是直角三角形.

16.解:(1)如果直角三角形的两直角边长分别为ab,斜边长为c,那么a2+b2c2

(2)∵Rt△ABE≌Rt△ECD,

∴∠AEB=∠EDC,

又∵∠EDC+∠DEC=90°,

∴∠AEB+∠DEC=90°,

∴∠AED=90°.

S梯形ABCDSRt△ABE+SRt△DEC+SRt△AED,

a+b)(a+b)=ab+ab+c2,

整理,得a2+b2c2

(3)∵ADc,BCAD,

a+bc,即

17.解:(1)当m=5,n=3时,

abc,

∴长度为a,b的边是直角边,

这时三角形的面积为:

(2)

m=5+t,n=5﹣t时,

m+n=10,

a+b+c=10(5+t)=10t+50,

mn>0,mn是互质的奇数可知,

t=2,

a+b+c=10×2+50=70,

符合条件的三角形的周长 为70.

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  1. CONNECT:[ UseTime:0.000561s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000790s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000333s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000257s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000494s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000566s ]
  8. SELECT * FROM `article` WHERE `id` = 491762 LIMIT 1 [ RunTime:0.000622s ]
  9. UPDATE `article` SET `lasttime` = 1774802461 WHERE `id` = 491762 [ RunTime:0.005415s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000272s ]
  11. SELECT * FROM `article` WHERE `id` < 491762 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000472s ]
  12. SELECT * FROM `article` WHERE `id` > 491762 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001780s ]
  13. SELECT * FROM `article` WHERE `id` < 491762 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000884s ]
  14. SELECT * FROM `article` WHERE `id` < 491762 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000818s ]
  15. SELECT * FROM `article` WHERE `id` < 491762 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000768s ]
0.091896s