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(20-2)*180

18*180

3240

The way that I remember this is that a triangle, 3 sides, has one triangle in it.

A four sided figure, if you draw one diagonal, has 2 triangles in it.

So there are 2 less triangles in a figure than the number of sides.

A triangle's interior angle measure is 180 degrees.

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Q: What is the sum of the interior angle of a twenty sided polygon?
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== ==


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