In the figure, the area of the shaded region is 75 cm square. Find the value of y.图形请见上方.

In the figure, the area of the shaded region is 75 cm square. Find the value of y.图形请见上方.



In the figure, the area of the shaded region is 75 cm square. Find the value of y.
图形请见上方.

In the figure, the area of the shaded region is 75 cm square. Find the value of y.图形请见上方.
阴影部分分成2个三角形的面积
公共部分设为S共
那么S共+S阴=1/2x10xy+1/2x10x12=60+5y
S共=60+5y-75=5y-15
=5h h=y-3
y随便取值 ,只要h取y-3 就能满足阴影部分为75
例如y取8 h取5成立 h是凹点到10的那个直线的距离

题中没给特殊角度？没有。图和题目已经完整给出了，没有任何缺失。 *现在的程度是初中一，没有教毕氏定理，请以初中一所教的方法解题。

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