Interior Angle - Math Is Fun

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Math is Fun Interior Angle

An Interior Angle is an angle inside a shape

interior exterior angles

Here's another example:

interior exterior angles

When we add up the Interior Angle and its corresponding Exterior Angle we get a Straight Angle (180°), making them "Supplementary Angles".

interior angles triangle 80 70 30

Interior angles appear in all polygons, from triangles to complex shapes.

The total of a shape’s interior angles depends on its number of sides.

See Interior Angles of Polygons for more info.

Interior Angles of Polygons Exterior Angles Supplementary Angles Complementary Angles Angles On a Straight Line Angles Around a Point Degrees (Angle) Geometry Index Copyright © 2025 Rod Pierce

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