4.7D

Front

What is a ray in geometry?

Back

A ray is a part of a line that starts at a point and extends infinitely in one direction.

Front

What is an angle?

Back

An angle is formed by two rays that share a common endpoint, called the vertex.

Front

What is a protractor used for?

Back

A protractor is a tool used to measure angles in degrees.

Front

How do you measure an angle using a protractor?

Back

Align one ray with the baseline of the protractor and read the degree measurement where the other ray crosses the protractor.

Front

What does it mean to construct an angle?

Back

To construct an angle means to draw it accurately using a protractor or compass.

Front

What is the measure of a right angle?

Back

A right angle measures 90 degrees.

Front

What is the measure of a straight angle?

Back

A straight angle measures 180 degrees.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

If ray AB is at 0 degrees, what angle does ray D need to be at to form a 105-degree angle with ray AB?

Back

Ray D needs to be at 105 degrees.