UNDERSTANDING QUADRILATERALS 1 41 BDw8P3. As before consider quadrilateral ABCD (Fig 3.6). Let P be anypoint in its interior. Join Pto vertices A, B, C and D. In the figure,consider APAB. From this we see x = 180º – m22 - mZ3;similarly from APBC, y = 180º-m24-m25, from APCD,2 = 180° - m26 - m27 and from APDA, w = 180° - mZ8- mZ1. Use this to find the total measure mZ1 + m2 + ...+ m28, does it help you to arrive at the result? Remember2x + 2y + 2x + Zw = 360°These quadrilaterals were convex. What would happen if theАFig 3.6B

UNDERSTANDING QUADRILATERALS 1 41 BDw8P3. As before consider quadril

1.	UNDERSTANDING QUADRILATERALS 1 41 BDw8P3. As before consider quadrilateral ABCD (Fig 3.6). Let P be anypoint in its interior. Join Pto vertices A, B, C and D. In the figure,consider APAB. From this we see x = 180º – m22 - mZ3;similarly from APBC, y = 180º-m24-m25, from APCD,2 = 180° - m26 - m27 and from APDA, w = 180° - mZ8- mZ1. Use this to find the total measure mZ1 + m2 + ...+ m28, does it help you to arrive at the result? Remember2x + 2y + 2x + Zw = 360°These quadrilaterals were convex. What would happen if theАFig 3.6B
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