Types of Angles

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

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

How can you identify an acute angle in a diagram?

Back

An acute angle is usually represented as a small angle, less than 90 degrees, often appearing sharp.

Front

How can you identify a right angle in a diagram?

Back

A right angle is often marked with a small square in the corner of the angle.

Front

How can you identify an obtuse angle in a diagram?

Back

An obtuse angle is larger than a right angle, appearing wider than 90 degrees.

Front

How can you identify a straight angle in a diagram?

Back

A straight angle forms a straight line, measuring exactly 180 degrees.

Front

What is the sum of angles in a triangle?

Back

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

Front

If one angle in a triangle is 90 degrees, what type of triangle is it?

Back

It is a right triangle.