用英文出的数学题

There is two squares.One is ABCD and another is EFGH.Their areas'  difference is 37.Q:What is the area of CDFG?

PICTURE：

中文：正方形ABCD与正方形BEFG放在一起。两个正方形面积之差等于37平方厘米。问：四边形CDGF的面积是多少？

解答：设正方形ABCD的边长是a,正方形BEFG的边长是b
四边形CDGF的面积
=(FG+CD)×CG÷2
=(b+a)×(a-b)÷2
=(a²-b²)/2
=37/2㎝²
=18.5㎝²

解答看不懂可以追问我

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