Q. 65.0( 7 Votes )

What is the number of diagonals in a

(i) heptagon (ii) octagon

(iii) polygon of 12 sides

Answer :

(i) Number of diagonals in Heptagon is


[n represents number of sides]




= 14


So, Number of diagonals in heptagon is 14.


(ii) Number of diagonals in Octagon is


[n represents number of sides]




= 20


So, Number of diagonals in octagon is 20.


(iii) Number of diagonals in polygon of 12 sides is


[n represents number of sides]




= 54


So, Number of diagonals in polygon of 12 sides is 54.


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