Question

) Find number of diagonals of a 10-sided polygon.​

Answer 1

Step-by-step explanation:

Assume that there are 10 points in a plane where no 3 of them are collinear which are the vertices of the given polygon.

The number of different lines that can be formed by joining these 10 points is 10

C

2

.

Hence, the required number of diagonals = Number of lines formed - Number of sides of the polygon

=10

C

2

−10=35

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Answer 2

35

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