interior angle

noun

Geometry.

interior angle

an angle of a polygon contained between two adjacent sides
any of the four angles made by a transversal that lie inside the region between the two intersected lines

interior angle

Any of the four angles formed inside two straight lines when these lines are intersected by a third straight line.
An angle formed by two adjacent sides of a polygon and included within the polygon.
Compare exterior angle

Discover More

First recorded in 1750–60

Discover More

Examples have not been reviewed.

We learn that the interior angles of triangles add up to 180°.

From

I got the first cut, but again, when I started cutting the interior angle, the bar worked its way out of the jig, and the tool dug in and broke.

From

I think this is fascinating because it means that in other geometries, there are triangles that have different sums of interior angles!

From

Each interior angle of a regular heptagon is a bit over 128 degrees, so when we put three of them together at a vertex, we get more than 360 degrees.

From

Squinch, skwinch, n. a small stone arch, or series of arches, across an interior angle of a square tower to support the sides of an octagonal spire.

From

Browse