1. In a quadrilateral PQRS, 2P = 50°, 2 Q = 50°. LR-60°. Find 2 S. Is this
quadrilateral convex or concave?
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Answer : angle P =50, angle Q = 60, angle R = 60. the sum of all angles in a quadrilateral is 360. If the diagonals of the quadrilateral is lying inside then the quadrilateral is a convex quadrilateral.
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