Solve for S S=(n-2)*180

$S = (n - 2) \cdot 180$

Apply the distributive property.

$S = n \cdot 180 - 2 \cdot 180$

Simplify the expression.

Move $180$ to the left of $n$ .

$S = 180 \cdot n - 2 \cdot 180$

Multiply $- 2$ by $180$ .

$S = 180 n - 360$

$S = 180 n - 360$

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