Answer:
6
cm
Explanation:
the diagonal divides the square into 2 right angles with legs 6 cm and hypotenuse h is the diagonal.
using Pythagoras' identity in the right triangle
the square on the hypotenuse is equal to the sum of the squares of the other 2 sides.
h² = 6² + 6² = 36 + 36 = 72 ( take square root of both sides )
h =
=
=
×
= 6
the diagonal is 6
cm