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Intro to Algebra/Geometry Angles DEGREES A unit of angle measure Every circle is divided into 360 equal parts called degrees PROTRACTOR A tool that measures degrees. It is a half circle marked with 180 degrees. ANGLE A geometric figure made up of two rays (sides) with a common endpoint. The endpoint is called the vertex of the angle. Naming Angles Types of Angles Acute, Right, Obtuse, Straight ACUTE ANGLES Angles that are greater that 0 and less than 90 degrees. RIGHT ANGLES Angles that equal 90 degrees OBTUSE ANGLES Angles that are greater than 90 degrees and less than 180 degrees. STRAIGHT ANGLES Angles that equal 180 degrees