Answer
E=$\frac{360}{n}$
Work Step by Step
E=180-$\frac{(n-2)180}{n}$
E=$\frac{180n}{n}$-$\frac{(180n-360)}{n}$
E=$\frac{180n}{n}$-$\frac{180n}{n}$+$\frac{360}{n}$
E=$\frac{360}{n}$
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