Geometry 1-6 Naming angles

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

Front

How do you name an angle using its vertex?

Back

An angle can be named using its vertex and points on each ray, for example, angle JVI is named using vertex V and points J and I.

Front

What are the three types of angles based on their measure?

Back

The three types of angles are acute (less than 90°), right (exactly 90°), and obtuse (greater than 90° but less than 180°).

Front

How do you denote an angle in long form?

Back

An angle in long form is denoted by the vertex and the points on each ray, for example, angle KLM is denoted as ∠KLM.

Front

What is the measure of an acute angle?

Back

An acute angle measures less than 90°.

Front

What is the measure of a right angle?

Back

A right angle measures exactly 90°.

Front

What is the measure of an obtuse angle?

Back

An obtuse angle measures greater than 90° but less than 180°.

Front

How do you identify the angle formed by two intersecting lines?

Back

The angle formed by two intersecting lines can be identified by naming the vertex and one point from each line.

Front

What is the difference between angle ∠FED and angle ∠FDE?

Back

Angle ∠FED is formed by rays FE and ED, while angle ∠FDE is formed by rays FD and DE.