0 an angle on the inside of a triangle or other polygon
1 an angle on the inside of a triangle or other polygon
An "exterior angle" of a triangle is an angle that is a linear pair (and hence supplementary) to an interior angle.
By the alternate interior angle theorem, "l" is parallel to "n".
A triangle, for example, can be identified by the length of its three sides, or by two sides and an interior angle, etc.
A hip-roofed porch runs the entire width of the five-bay tripartite main facade, on the interior angle.
One interior angle in a regular triacontagon is 168, meaning that one exterior angle would be 12.
If the corresponding interior angle is a reflex angle, the exterior angle should be considered negative.
The exterior angle is the supplementary angle to the interior angle.
Then one of the alternate angles is an exterior angle equal to the other angle which is an opposite interior angle in the triangle.
