1 . 求下列图形中阴影部分的面积.
(1)如图,在
中,
,
,
,
是圆
的直径,点
在圆上;
![](https://img.xkw.com/dksih/QBM/2021/3/11/2675494851895296/2682201377415168/STEM/7cb3adff-52ca-45a0-a677-343d4d6d0a3e.png?resizew=156)
(2)如图,在四边形
中,
,
,
,
,
,四边形
为正方形.
(1)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2021/3/11/2675494851895296/2682201377415168/STEM/7cb3adff-52ca-45a0-a677-343d4d6d0a3e.png?resizew=156)
(2)如图,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbab4a3f9636fe3eeee75ba79d08a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e2a96ad10f818c9a5ad7ef46a304c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d70fb53a3bc46be3e6365f5ed26496.png)
![](https://img.xkw.com/dksih/QBM/2021/3/11/2675494851895296/2682201377415168/STEM/06ad0780-6441-4c1f-a767-3e44de384056.png?resizew=199)
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2 . 在
中,
,如图1,分别以
,
,
为边向外作等边三角形
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/2021/1/4/2629134513127424/2680292480860160/STEM/1d9e6824ec76439c99f455203ea74c5f.png?resizew=117)
(1)若
,
,则
______.
(2)如图2,将
沿
翻折,点
的对应点记为
,
![](https://img.xkw.com/dksih/QBM/2021/1/4/2629134513127424/2680292480860160/STEM/c84865e1a8284e9d966502c276eb324a.png?resizew=144)
①连接
,请求出
的度数.
②若
保持不变,随着
的长度变化,点
也随之运动,试探究
的值是否变化,若不变,求出
的值;若改变,求出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/2021/1/4/2629134513127424/2680292480860160/STEM/1d9e6824ec76439c99f455203ea74c5f.png?resizew=117)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b842ad18231c961c441810cfc3843742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/317abb1d7da562cd4ef220a98768d19f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d5a33a95ad18831ef04770e80576ce.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2021/1/4/2629134513127424/2680292480860160/STEM/c84865e1a8284e9d966502c276eb324a.png?resizew=144)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9b4a78c3b85dafdaec2e4e6dc87bd7.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04725e51b4870658f74de79403e3898f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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3 . 如图,已知直线l的解析式为:y
x+4,它的图象与x轴、y轴分别交于A、B两点.
(1)求A、B两点的坐标及线段AB的长度;
(2)已知y轴上一点C的坐标为(0,m).
①若S△ABC=6,求点C的坐标;
②若点C到直线l与到x轴的距离相等,请直接写出点C的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3587ec884cc085c7dde28d56d21eef79.png)
(1)求A、B两点的坐标及线段AB的长度;
(2)已知y轴上一点C的坐标为(0,m).
①若S△ABC=6,求点C的坐标;
②若点C到直线l与到x轴的距离相等,请直接写出点C的坐标.
![](https://img.xkw.com/dksih/QBM/2021/3/1/2668712122368000/2673408261513216/STEM/c0bea6a51f6e4fd6bed9b95dfc01a9f3.png?resizew=218)
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19-20八年级·浙江杭州·期末
4 . 已知
中,
=90°,如图,作三个等腰直角三角形
,
,
,
,
,
为斜边,阴影部分的面积分别为
,
,
,
.
(1)当
=6,
=8时,
①求
的值;
②求
-
-
的值;
(2)请写出
,
,
,
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a3d8b2c55aa1dd6463651d19735cee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20cc7678191d4e4b21da93e8fd25444c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
(2)请写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/924e81db-d96d-4fde-a891-6404c8f28acd.png?resizew=227)
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5 . 已知:如图,AB=12cm,AD=13cm,CD=4cm,BC=3cm,∠C=90°.求△ABD的面积.
![](https://img.xkw.com/dksih/QBM/2021/1/29/2646681752158208/2649320002412544/STEM/4980ca0c-0ad5-4067-871c-37e24029d947.png?resizew=222)
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2021-02-02更新
|
391次组卷
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4卷引用:上海闵行区八年级上学期期末测试卷
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6 . 勾股定理是人类最伟大的科学发现之一,在我国古代《周髀算经》中早有记载.如图①,以直角三角形的各边为边分别向外作正方形,再把较小的两张正方形纸片按图②的方式放置在最大正方形内.若图中阴影部分图形的面积为3,则较小两个正方形重叠部分图形的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/081f2400-e525-4242-b6d6-b5e349c96dad.png?resizew=247)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/081f2400-e525-4242-b6d6-b5e349c96dad.png?resizew=247)
A.2 | B.3 | C.5 | D.6 |
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|
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|
6卷引用:吉林省长春市南关区2020-2021学年八年级上学期期末数学试题
吉林省长春市南关区2020-2021学年八年级上学期期末数学试题(已下线)易错05 勾股定理与面积问题易错-2020-2021学年八年级数学下册期末突破易错挑战满分(人教版)吉林省长春市朝阳区吉林大学附属中学2022-2023学年八年级上学期第三次月考数学试题陕西省咸阳市实验中学2021-2022学年八年级上学期第一次月考数学试题吉林省长春市朝阳区长春外国语实验学校2022-2023学年八年级上学期期末数学试题吉林省长春市长春外国语(实验)学校2022-2023学年八年级上学期期末数学试题
7 . 我国汉代数学家赵爽为了证明勾股定理,创作了一幅“弦图”,后人称其为“赵爽弦图”(如图①),图②由弦图变化得到,它是由八个全等的直角三角形和一个小正方形拼成.若正方形EFGH的面积为2,则正方形ABCD和正方形MNKT的面积之和为( )
![](https://img.xkw.com/dksih/QBM/2021/1/8/2631729636483072/2639322946854912/STEM/71d5350d-c021-4f8f-9655-b7f5887da7de.png)
![](https://img.xkw.com/dksih/QBM/2021/1/8/2631729636483072/2639322946854912/STEM/71d5350d-c021-4f8f-9655-b7f5887da7de.png)
A.3 | B.4 | C.5 | D.6 |
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8 . 如图,在平面直角坐标系中,点
、点
,点P是x轴正半轴上—动点,给出4个结论:
①线段AB的长为
;
②在
,若
,则
的面积是5;
③当
时,点P的坐标为
;
④设点P的坐标为
,则
的最小值为
.
其中正确的结论有______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc878a5fd7b508cf817cbb65d3940547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d598b53ebe67b3576315001138268eb.png)
①线段AB的长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d86c2947213ad51595cfe30e13739a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4174ba144bcf68819f69dbf0d169ec5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a812a9b58ccba331cfd21d244329af01.png)
④设点P的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a724e7d61a8d708ef50d501ad5fe9ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d258bf28eff79d7ddb4101309d68f98a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
其中正确的结论有
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/f2a7ce94-35e8-44d9-8658-d5103238d4ab.png?resizew=148)
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|
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6卷引用:四川成都锦江区成都七中嘉祥外国语学校2020~2021学年八年级上学期期中数学试题
四川成都锦江区成都七中嘉祥外国语学校2020~2021学年八年级上学期期中数学试题(已下线)专题3.14 《位置与坐标》全章复习与巩固(培优篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(北师大版)(已下线)专题4.17 《平面直角坐标系》全章复习与巩固(培优篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(浙教版)(已下线)专题3.21 平面直角坐标系背景下的面积问题(分层练习)(培优练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(北师大版)(已下线)专题5.24 平面直角坐标系背景下面积问题(分层练习)(培优练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(苏科版)福建省龙岩市新罗区龙岩高级中学2023-2024学年八年级下学期月考数学试题
9 . 图中字母A所代表的正方形的面积是( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/886f1a0c-108e-48fd-a914-73cc93d61979.png?resizew=115)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/886f1a0c-108e-48fd-a914-73cc93d61979.png?resizew=115)
A.175 | B.225 | C.400 | D.625 |
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10 . 如图,分别以直角三角形
的三边为斜边向外作直角三角形,且
,
,
,这三个直角三角形的面积分别为
,
,
,且
,
,则S
( )
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060247547904/2633231200681984/STEM/5e511090598c4db6bd52f50abb3b32bd.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/490b9624a31f9c93fa27b978da7b1719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7720a24ccafd483cffe43b95be4ee20d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927331b3f7974c56be2a0cff0d13db94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06c2b249035369cff1a9febe23f5d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef354e5c5ff828cc8d27c71badd40f98.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2618060247547904/2633231200681984/STEM/5e511090598c4db6bd52f50abb3b32bd.png?resizew=159)
A.25 | B.32 | C.7 | D.18 |
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