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Find the number of sides in a regular polygon if its each interior angle is 160°.

A17

B14

C18

D15

Answer:

C. 18

Read Explanation:

interior angle=(n2)×180n=\frac{(n-2)\times 180}{n}

160×n=(n2)180160\times n=(n-2)180

8n=9n188n=9n-18

n=18n=18


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