Naming Angles

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

How do you name an angle using three points?

Back

An angle can be named using three points: the vertex point in the middle and one point from each ray. For example, angle ABC has vertex B.

Front

What is the correct notation for naming an angle?

Back

Angles are typically denoted by the symbol ∠ followed by the three points that form the angle, e.g., ∠ABC.

Front

What does the notation ∠A represent?

Back

∠A represents an angle that is named using a single letter, where A is the vertex of the angle.

Front

What is the difference between acute, right, and obtuse angles?

Back

Acute angles are less than 90°, right angles are exactly 90°, and obtuse angles are greater than 90° but less than 180°.

Front

How can you identify congruent angles?

Back

Congruent angles have the same measure. They can be marked with the same number of arc marks in diagrams.

Front

What is the significance of the order of points when naming angles?

Back

The order of points matters; it indicates the direction of the angle. For example, ∠ABC is different from ∠CBA.

Front

What is a vertical angle?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always congruent.

Front

How do you determine the measure of an angle using a protractor?

Back

To measure an angle with a protractor, align the protractor's baseline with one ray of the angle and read the measurement where the other ray crosses the protractor.

Front

What is a complementary angle?

Back

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