Question

how many diagonals does a polygon of 10 sides have?​

Answer 1

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35 diagonals

1. How many diagonals of a regular decagon (a 10 sided polygon) are not parallel to any of the sides (AMC12)? A decagon has (10 2) – 10 = 35 diagonals. Each pair of opposing sides has three diagonals which are parallel to them, so 5*3 = 15 of the diagonals are parallel to a side.

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Answer 2

Answer:

35 diagonal

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