Measuring and Constructing Angles

Opposite rays are two rays that are part of the same line and have only their endpoints in common.

The figure formed by opposite rays is also referred to as a straight angle. There is another case where two rays can have a common endpoint. This figure is called an angle.

Some parts of angles have special names. The common endpoint is called the vertex, and the two rays that make up the angle are called the sides of the angle.

Measuring and Constructing Angles

Practice: Answer the following exercises about measuring and constructing angles.

Measuring and Constructing Angles 1

Measuring and Constructing Angles 2

Measuring and Constructing Angles 3