Question 422300
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Hi
The diagonal of a rectangle is 10 cm and is twice the length of one of the sides.
One side 5cm: Applying the Pythagorean Theorem the other side is: 
{{{sqrt(100-25)= sqrt(75) = 5sqrt(3)}}}
A(rectangle) = L*W = {{{5cm*5sqrt(3)}}}cm = {{{25sqrt(3)}}}cm^2