Question

Write the formula for finding the number of diagonals of a regular polygon.​

Answer 1

$\bf\large\underline{Answer:}$

According to the formula:

• number of diagonals = n (n-3)/ 2.
• So, 11-sided polygon will contain 11(11-3)/2 = 44 diagonals.
• Example : In a 20-sided polygon, one vertex does not send any diagonals.

Answer 2

Answer:

Number of diagonals = n (n-3)/ 2 , where n is the number of sides of the polygon

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