Question

What is the messaure of x? (Assume the quadrilateral is a square.)

Answer 1

From the basic knowledge of Pythagoras theorem,

20^2 = x ^2 + 12 ^2

400 = x ^2 + 144

x^2 = 400 - 144

x^ 2 = 256

square root both sides, we have :

x = 16 cm