Question

Find the length of the diagonal of a square whose area is 128 cm². Also, find its perimeter.

Answer 1

Area of the square = 128 cm²

Area = \(\frac{1}{2}d^2\) (where d is a diagonal of the square)

\(\Rightarrow 128=\frac{1}{2}d^2\)

\(\Rightarrow\) d² = 256

\(\Rightarrow\) d = 16 cm

Now,