wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

1)A polygon has 27 diagonals. How many sides does it have?

Open in App
Solution


The formula for the no. of diagonals of a ’n' sided polygon is n(n-3)/2 .

It works for triangle (0 diagonals) , quadrilateral (2 diagonals) , pentagon (5 diagonals) and for every another polygon.

Let's come to the problem.

No. Of diagonals = n(n-3)/2 = 27

n(n-3) = 54

n^2 - 3n -54 = 0

n^2 - 9n + 6n - 54 = 0

n(n-9) + 6(n-9) = 0

(n-9)(n+6) = 0

n = 9, -6

(excluding -6)

n = 9

The polygon has 9 sides.

It is a Nonagon.


flag
Suggest Corrections
thumbs-up
88
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Types of Quadrilaterals
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon