Question

what is the length of a diagonal of a square, if the length of its side is 8 cm?​

Answer 1

Step-by-step explanation:

let the square be ABCD

and the sides are 8cm,8cm,8cm,8cm

now take the triangle ABC

AB=8cm,BC=8cm

(AC)2=(AB)2+(AC)2

2is actually the power

(AC)2=(8)2+(8)2

(AC)2=64+64

(AC)2=128

AC=√128