Triangle inscirbed square

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by satish.nagdev » Sat Dec 05, 2009 9:09 pm
Image

i hope as per image it will be clear for you

(1/2*x)^2 + x^2 = (20)^2

so 5/4 * (x^2) = 400 hence, x^2 = 320 which is what we want.
Wounded by GMAT but not dead