Measuring and 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

What are the three 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.

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

How do you name an angle?

Back

An angle can be named using three points, with the vertex point in the middle (e.g., ∠FED).

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

How do you identify an angle in a diagram?

Back

Look for the vertex and the rays that form the angle, then use the appropriate notation to name it.

Front

What is the sum of angles in a triangle?

Back

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