Naming Angles

Front

What is an angle?

Back

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

Front

What is the vertex of an angle?

Back

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

Front

How do you name an angle formed by two lines?

Back

An angle can be named using the vertex and a point from each ray, such as ∠ABC.

Front

What is a ray?

Back

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

Front

What is a line segment?

Back

A line segment is a part of a line that has two endpoints.

Front

How do you identify the angle formed by two lines?

Back

The angle is identified by the letters representing the rays and the vertex, such as ∠XYZ.

Front

What is the correct way to name ∠XYZ?

Back

You can name it as ∠XYZ, ∠YZX, or ∠ZXY.

Front

What is the relationship between angles and lines?

Back

Angles are formed when two lines intersect or when two rays meet at a vertex.

Front

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

Back

An acute angle is less than 90°, a right angle is exactly 90°, and an obtuse angle is greater than 90°.

Front

What does it mean for angles to be complementary?

Back

Two angles are complementary if their measures add up to 90°.