Exterior Angle
The Exterior Angle is the angle between any side of a shape and a line extended from the next side.
Another example:
Another example:
When we add up the Interior Angle and Exterior Angle we get a Straight Angle (180°), so they are "Supplementary Angles".
Exterior Angle + Interior Angle = 180°
Example: If the Interior Angle is 70°, what is the Exterior Angle?
We know they add up to 180°:
Exterior Angle = 180° − 70° = 110°