rectangle is inscribed in a circle with diameter 6m.The formula for the area of the rectangle i
问题描述:
rectangle is inscribed in a circle with diameter 6m.The formula for the area of the rectangle i
答
设长方形的对角线与其中一边的夹角是a
则有 面积S=6*sina*6*cosa=36sina*cosa=18sin(2a)
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