平行四边形长边是短边的2倍,一条对角线与短边垂直,则这个平行四边形各角的度数分别为________ .
20-21八年级下·全国·课后作业 查看更多[2]
更新时间:2021-10-05 20:45:52
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【推荐1】如图,AB,CD相交于点O,AC⊥CD于点C,若∠BOD=38°,则∠A等于______ °
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/72cb28b4-904b-4d26-916e-c7d45345b08c.png?resizew=157)
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【推荐2】如图,在
中,
,
,若
,且点
恰好落在AB上,则
的度数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d2eae98e1683fbb9533584450dd696.png)
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【推荐1】在
中,
,按以下步骤作图:①以点A为圆心,以适当长为半径作弧,分别交
于点M,N;②分别以点M,N为圆心,以大于
的长为半径作弧,两弧在
内交于点O,作射线
,交
于点D,则
的值为______ .
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【推荐2】如图,在
中,
,
,以点A为圆心,小于
的长为半径作弧,分别交
,
于M,N两点;再分别以点M,N为圆心,大于
长为半径作弧,两弧交于点P,作射线
交
于点D.若
的面积为9,则
的面积为_________ .
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【推荐1】如图,在▱ABCD中,∠A=72°,将□ABCD绕顶点B顺时针旋转到▱A1BC1D1,当C1D1首次经过顶点C时,旋转角∠ABA1=_____ °.
![](https://img.xkw.com/dksih/QBM/2019/6/4/2218219527340032/2220556549644288/STEM/70415708c00c41e686c49f926316021d.png?resizew=151)
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【推荐2】如果三个大小形状完全一样的平行四边形能够围成一个正六边形,那么这样的平行四边形的其中一个内角的度数为______ °(只填写内角是锐角的角的度数).
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