Definition: The area between the
rays that make up an
angle, and extending away from the
vertex to infinity.

Try this Drag an orange dot. The point K will indicate if it
is within the interior of angle ∠ABC (shown in yellow).
Or, drag the point K.

The interior of an angle is the area between the two rays that define it, shown in yellow above. Even if the angle is made up of line segments and so have a finite length, the interior extends beyond them forever. In the figure above, drag the point K and notice that it is in the interior of ∠ABC even beyond the ends of the line segments BA and BC forming the angle.

NOTE: Do not confuse this with the interior angles of triangles and other polygons.

- Vertical angles
- Complementary angles
- Supplementary angles
- Linear pair
- Adjacent angles
- Corresponding angles
- Alternate interior angles
- Alternate exterior angles
- Interior angles of a transversal
- Exterior angles of a transversal

(C) 2011 Copyright Math Open Reference.

All rights reserved

All rights reserved