
Interior
Refers to an object inside a geometric figure, or the entire space inside a figure or shape.

The interior angles of a polygon and the method for calculating their values.

Properties of the interior angles of a triangle

Defines what is meant by 'interior of an angle'

Definition and properties of alternate interior angles, showing the pairs of angles associated with a transversal

A discussion and example of how the interior and exterior angles of a polygon are related, especially when the polygon is concave.

Definition and properties of the interior angles of a transversal
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