Question

The total number of diagonals in a regular polygon is 5.Find the number of sides the polygon has.
Use the following formulae (given n is the no. of sides):
Number of diagonals from a vertex: n-3
Total no. of diagonals: n×[(n-3)/2]

Answer 1

Answer:

Step-by-step explanation:

5 = n×[(n-3)/2]

10= n×(n-3)

10= n^2 -3n

0= n^2 -3n-10

n=5or n=-2(Not admissible)

No of sides of polygon = 5