Angle Measures Part 1

Front

What is the definition of an angle?

Back

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

Front

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

Back

The different types of angles are acute (less than 90°), right (exactly 90°), obtuse (greater than 90° but less than 180°), straight (exactly 180°), reflex (greater than 180° but less than 360°), and full rotation (360°).

Front

How do you measure an angle using a protractor?

Back

To measure an angle using a protractor, align the baseline of the protractor with one ray of the angle, ensuring the vertex is at the center point of the protractor. Then, read the measurement where the other ray intersects the numbered scale.

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

What is a complementary angle?

Back

Complementary angles are two angles whose measures add up to 90°.

Front

What is a supplementary angle?

Back

Supplementary angles are two angles whose measures add up to 180°.

Front

What is the relationship between vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect, and they are always equal in measure.

Front

What is the difference between adjacent and non-adjacent angles?

Back

Adjacent angles share a common vertex and a common side, while non-adjacent angles do not share a common side.

Front

How can you determine if two angles are congruent?

Back

Two angles are congruent if they have the same measure.

Front

What is the angle addition postulate?

Back

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