The diagonal of a square is 20 cm what is the length (in cm) of its side?

13\(\sqrt {2}\) cm 8\(\sqrt {2}\) cm 10\(\sqrt {2}\) cm 5\(\sqrt {2}\) cm

10\(\sqrt {2}\) cm

Diagonal of a square = \(\sqrt {2}\)a = 20 cm ⇒  a =  10\(\sqrt {2}\) cm