# Q3. As before consider quadrilateral ABCD (Fig 3.6). Let P be any point in its interior. Join P to vertices A, B, C and D. In the figure, consider . From this we see ; similarly from , , from ,  and from , . Use this to find the total measure , does it help you to arrive at the result? Remember .

Answers (1)

As we know

Hence, sum of .

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