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Homework help has a great explanation of the answer to this question (see reference for the link).

We use a formula to find the sum of the interior angles of any polygon. In this formula, the letter n stands for the number of sides, or angles, that the polygon has.

sum of angles = (n - 2)180°


So for a triangle (n = 3), The angles add to 180
For a square (n = 4), the angles add to 360
For a octagon (n = 8) the angles add to 1080
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14y ago
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13y ago

It depends on the polygon. The sum of the interior angles of a triangle is 180o. For every additional side, there are 180o more. The sum of the interior angles of a polygon can be found using this equation:

Sa=180(sn-2)

Where Sa=the sum of the interior angles, and

sn=the number of sides that the polygon has.

Sn has to be a whole number greater than 2.

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14y ago

It's the number of sides minus two, then times 180.

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Q: What is sum of the angles of a polygon?
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