Angle Vocabulary

An angle whose measure if less than 90 degrees.

• Obtuse Angle

• Acute Angle

• Right Angle

• Adjacent Angle

Angles that are next to each other. They share a common vertex and ray (side).

• Obtuse Angles

• Right Angles

• Adjacent Angles

• Acute Angles

The amount of degrees between two line segments or rays.

• Angle

• Acute Angle

• Ray

• Vertical Angle

Two or more angles that add up to 180 degrees.

• Protractor

• Supplementary Angle

• Vertex

• Complementary Angle

A measure for angles. There are 360 degrees in a full rotation. The symbol for degrees is °

• Vertex

• Vertical Angle

• Degrees

• Ray

An angle whose measure is greater than 90 degrees.

• Obtuse Angle

• Supplementary Angle

• Right Angle

• Acute Angle

An instrument used in measuring or drawing angles. Start by lining up one line on zero degrees.

• Vertex

• Ray

• Degrees

• Protractor

A part of a line with a start point but no end point.

• Vertical Angle

• Protractor

• Ray

• Vertex

An angle that measures exactly 90 degrees.

• Right Angle

• Obtuse Angle

• Complementary Angle

• Acute Angle

Two or more angles that add up to 90 degrees.

• Right Angle

• Supplementary Angle

• Adjacent Angle

• Complementary Angle