I stuck in this problem: https://www.gregmat.com/problems/problem/ADGJ-is-a-square-of-size-1/
Can you explain the solution to this problem? Thanks in advance.
Area of shaded portion = Area of square - 2(Area of red triangle) - 2(Area of blue triangle)
From the information
Area of square = 1
base and height of red triangle = x
base and height of blue triangle = kx +x
Area of triange = \frac{b*h}{2}
Plug in the values
You will get the following equation :
1-x^2-(kx+x)^2
Which is same as Option D
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