The length of a diagonal of a square is 20 millimeters. Find the perimeter of the square. Find the length of one side of the square.

Answer 1

Diagonal = 20 mm

Square = 90 degrees each corner so can split square into 2 right triangles of hypotenuse 20 mm.

side^2 + side^2 = 20^2 mm

2 * side ^2 = 400 mm

side ^ 2 = 200 mm

side = 14.14 mm

Perimeter = 4 * side = 4 * 14.14 = 56.56 mm