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To find the interior angle of a regular n sided shape you use the following formula:

(n-2)180/n

To calculate the angle size for an octagon, which has 8 sides, you simply plug n=8 into this equation. That gives (8-2)180/8

=6x180/8

=135

Thus the angles in a regular octagon are all 135 degrees.

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13y ago
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Q: What are angles in a octagon?
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