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

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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°

then as all are equal .'. x+x+x+x=360 (angle sum property of quadrilateral)

4x=360

x=90