ATA PreAlgebra Unit 7 Lesson 1 Angles

An angle is formed by two __________ with a common endpoint.

• rays

• lines

• points

• planes

Parts of an Angle: This common endpoint is called the _______________.

• vertex

• angle

• side

• point

Parts of an Angle: The rays are called the ____________.

• sides

• vertices

• angles

• points

Symbol for an angle: _____

• ∠

• ≈

• ≡

• ∞

Naming Angles: Angles are typically named using ______________ letters.

• three

• two

• four

• five

Naming Angles: The __________ letter must always represent the __________.

Naming Angles: Angles can also be named using just the vertex if it is the only angle located at that vertex.

• vertex

• side

• arc

• line

When referring to the measure of an angle, use a lowercase _______.

Angle Measures: Example: ________________________________

• m∠ABC = 60°

• m∠ABC = 90°

• m∠ABC = 120°

• m∠ABC = 45°

Name the vertex of the angle.