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Grade: 11 

                        
The interior angles of polygon are in A.P. If the smallest angle is 120 degree and the common different is 5, then the number of sides of the polygon is :
4 years ago

Answers : (1)

Rounak banerjee
11 Points 
							Sum of all int. angles = 180( n - 2)first term(a)=120d=5sum=n/2(2a+(n-1)d)so  n(240+5n-5)=360(n-2) Solve for n
4 years ago
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