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Wiki User

The formula to solve the problem is S= 180(n-2). Your n is the number that they give you which is 28. So you just put 28 into where n is {180(28-2)} and solve it.

step 1 =180(n-2)

step 2 =180(28-2)

step 3 =180(26)

step 4 =4680

The answer is 4680.

Correct me if I am wrong... I hope that help