Sum of inner angles

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

Correct result:

d =  0

Solution:

n=3…s3=180∘ n=4…s4=s3+180∘ n=5…s5=s4+180∘ s=180n−360=180(n−2) d=0

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