Question

a quadrilateral has its four interior angels equal.what is the measure of each interior angel.

Answer 1

(A Quadrilateral has 4 straight sides)

90° + 90° + 90° + 90° = 360°
80° + 100° + 90° + 90° = 360°
A Square adds up to 360°

Let's tilt a line by 10° ... still adds up to 360°!The Interior Angles of a Quadrilateral add up to 360°

Answer 2

let each int. angle be x
then as all are equal .'. x+x+x+x=360  (angle sum property of quadrilateral)
                                       4x=360
                                         x=90       ans