Question

please solve the above question​

Answer 1

Answer:

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Answer 2

Answer(s)

Smallest angle=120degree

Common difference=5

A P is 120, 125, 130,……..

The sum of interior angles of a polygon= (n-2)180

Hence Sum of n terms of an A P = (n-2)180

n/2 {2.120+(n-1)5} = 180(n-2)

5n^2 -125n +720 = 0

n^2 -25n +144=0

n=9 or 16

hence number of sides can be 9 or 16

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