So, the number of triangles will be less 4Hence, number of triangles f – InterviewSolution

1.	So, the number of triangles will be less 4Hence, number of triangles formed- 120-4 116XAMPLE 14A polygon has 20 diagonals. Find the number of its siSolution:
Answer» number of sides are s,The number of diagonals D = s(s-3)/2by solve this equation 40 = s^2-3sBy solve this we get s = 8, -5so the number of sides are 8

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