Angles, Angle Addition, and Bisector

Front

What is an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

Front

What is the vertex of an angle?

Back

The vertex is the point where the two rays of an angle meet.

Front

What are the different types of angles based on their measures?

Back

1. Acute angle: less than 90 degrees. 2. Right angle: exactly 90 degrees. 3. Obtuse angle: more than 90 degrees but less than 180 degrees. 4. Straight angle: exactly 180 degrees.

Front

What is angle addition postulate?

Back

The angle addition postulate states that if point B is in the interior of angle AOC, then the measure of angle AOB plus the measure of angle BOC equals the measure of angle AOC.

Front

How do you determine if an angle is acute or obtuse?

Back

An angle is acute if its measure is less than 90 degrees and obtuse if its measure is more than 90 degrees but less than 180 degrees.

Front

What is a bisector of an angle?

Back

An angle bisector is a ray that divides an angle into two equal parts.

Front

If angle A measures 40 degrees, what is the measure of its bisector?

Back

The measure of the bisector of angle A is 20 degrees.

Front

What is the sum of the measures of angles on a straight line?

Back

The sum of the measures of angles on a straight line is 180 degrees.

Front

What is the measure of a right angle?

Back

A right angle measures exactly 90 degrees.

Front

If two angles are complementary, what is the sum of their measures?

Back

The sum of the measures of complementary angles is 90 degrees.