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Answer 1

1. A quadrilateral has 4 sides, 4 angles, 4 vertices and 2 diagonals

2.the number of pairs of adjacent angles of a quadrilateral is 4 and the number of pairs of opposite angles of a quadrilateral is 2

3.The sum of angles of a quadrilateral is 360 degrees.

4. If each angle is x degrees then x+x+x+x=360 (sum of all angles in quadrilateral is 360 degrees)

4x=360

x=360/4

x=90

5. The point of intersection of diagonals of a quadrilateral lies in the center of the quadrilateral.