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Assuming that you mean the inside angle is 108 the answer is a pentagon.

Each angle inside the polygon forms an acute angle on the outside with the next side. The measurement of the exterior acute angle is:

180 - 108 = 72 .

Since all the acute angle around the outside must add up to 360 we find:

360 / 72 = 5

There are five acute angles and therefore five sides to the polygon.

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Q: What type of polygon must have angles that each measure 108?
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