In an quadrilateral PQRS. angle P= 70°, angle Q= 90°, angle R= 55°. Find the measure of angle S. What kind of quadrilateral is it, convex or concave
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∠P+∠Q+∠R+∠S=360°
⇒50° + 50°+60°+∠S=360°
∠S = 200° , which is greater than 180°
Concave quadrilaterals are quadrilaterals that have one interior angle that exceeds 180 °
Therefore , the quadrilateral PQRS is concave.
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