Can anybody explain how to solve the question

The solution explains only formula but how did the formula come to be whats the logic, also i did not understand what convex and concave polygon means.

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Comments (2)

how did the formula come to be whats the logic

GPT does a much better job than what I could type right now (a bit sleepy ahah): https://chatgpt.com/share/6a95c7f9-ed3c-83e8-ab2d-b2d90f0d98b5

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what convex and concave polygon means

Define Convex polygon and concave polygon-class-9-maths-CBSE

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