Identify Angles: Right, Acute, & Obtuse

Front

What is an obtuse angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is an acute angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is a right angle?

Back

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

Tags

CCSS.4.G.A.1

Front

How can you identify an obtuse angle?

Back

An obtuse angle can be identified as it opens wider than a right angle.

Tags

CCSS.4.G.A.1

Front

How can you identify an acute angle?

Back

An acute angle can be identified as it opens narrower than a right angle.

Tags

CCSS.4.G.A.1

Front

How can you identify a right angle?

Back

A right angle can be identified by its square corner, often marked with a small square.

Tags

CCSS.4.G.A.1

Front

What is the sum of angles in a triangle?

Back

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

Tags

CCSS.8.G.A.5

Front

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

Back

It is a right triangle.

Tags

CCSS.4.G.A.2

Front

If a triangle has one obtuse angle, what type of triangle is it?

Back

It is an obtuse triangle.

Tags

CCSS.4.G.A.2

Front

If all angles in a triangle are acute, what type of triangle is it?

Back

It is an acute triangle.

Tags

CCSS.4.G.A.2