THE MOST IMPORTANT QUESTION OF CBSE 2020 CLASS 10TH MATHS. PLEASE SOLVE IT FAST ....... (standard)..
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Smallest angle=120degrees
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)
5n2 -125n +720 = 0
n2 -25n +144=0
n=9 or 16
Hence number of sides can be 9 or 16
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