Interior and exterior of an angle.
On the screen, we can see two rays making an angle BAC. Some points other than A, B and C are also present on this plane. Let us move the points A and B and observe how the position of other points in the plane changes in terms of whether they lie within the interior or the exterior part of angle BAC.
1. Which is the interior angle and which is the exterior angle (red or green)? 2. Which points (other than A,B and C) lie in the interior part of angle BAC and which ones lie in its exterior part, for some different positions of angle BAC.