# What is the measure of each interior angle of an 18 sided polygon?

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An alternative method is to use the exterior angle.

the sum of the exterior angles is ALWAYS

So you can find the size of the exterior angles of a regular polygon quite easily:

If there are

The sum of the exterior and interior angles is

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Each interior angle of an 18 sided polygon is

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Sum of the interior angles of a polygon is given by the formula

Since it’s an 18 sided polygon,

Therefore

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