Question

show that each angle of a square is right angle

Answer 1

In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or right angles). It can also be defined as a rectangle in which two adjacent sides have equal length.

Answer 2

since all the sides ,angles are equal so  the angles in a quadrilateral add up to 360 then 360 divided by 4 must be 90.