A right angle is 90° or a quarter turn. It looks like the corner ... s vertex - the point where two lines meet. Line up one side of the angle with the zero line on the protractor.

Angles are based on parts of a full turn, which is 360°. A quarter turn is 90° and is called a right angle. A half turn is 180° and is known as a straight angle (or angle on a straight line).

An curved arrow pointing right. If you look closely at a quarter or a dime, you'll see tiny grooves all along the edge. They were put there for a very important reason. The process is called ...