Angles can be measured with
sexagesimal degrees. A right angle is
equal to 90 degrees.
Radians are another way of
measuring angles.
If you wish to understand the following visual, you should
revise the concepts of angle and arc.
angle: the space between
two straight lines that diverge from a common point (vertex).
arc: is the circular line
which surrounds the angle at the end of two segments.
