The figure above shows the length of the sides of an equiang

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The figure above shows the length of the sides of an equiangular polygon.What is the area of the polygon?

这道题自己会做了求下面这道题解题思路
O and P are the centers of two circles .If each circle has radius r,what is the area of the shaded region

如图,图中多边形各边长已经在图中标出且该多边形各内角相等那么其面积是?

显然各内角为135.然后很显然该多边形非常对称,所以连接对应顶点可以知道其面积为5个面积为1的正方形加4个腰为1的等腰直角三角形,所以面积为7.

如图,两圆有相同半径设为r,那么图中阴影部分面积为多少?

连接O与P,它将图形分为2个边长为r的等边三角形,所以面积为r平方乘根号3除2.

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