Question

construct a square with a diagonal of length 8 cm.

Answer 1

Understand your question

Answer 2

Let the sides of that sq. be X
By pythagoras theorem in which diagonal will be ur hypotenuse of that rt. triangle
${64}^{2} = {x}^{2} + {x}^{2} \\ {64}^{2} = 2 {x}^{2} \\ {x}^{} = \sqrt[]{36} \\ x = 6$
now u can draw a sq. with side 6cm.