Answers

2014-08-10T19:04:35+05:30
(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°
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2014-08-10T19:36:22+05:30
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
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