A right angle is exactly ¼ of a full 360 degree turn. When two straight lines intersect each other to form a right angle, the turn is measured as 90 degrees. Just think of it as slicing a pizza ...

An angle is the amount of turn between two lines. Angles are measured in degrees ... is 360°. A quarter turn is 90° and is called a right angle. A half turn is 180° and is known as a straight ...