Sum of inner angles

Prove that the sum of all inner angles of any convex n-angle equals (n-2).180 degrees.

Correct answer:

d =  0

Step-by-step explanation:

n = 3  s3 = 180° n=4  s4 = s3 + 180° n=5  s5 = s4 + 180° s = 180n  360 = 180(n2) d=0

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