Classify Triangles by Sides and 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

What is a scalene triangle?

Back

A scalene triangle is a triangle with all sides of different lengths.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle with at least two sides of equal length.

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle with all three sides of equal length.

Front

What is an acute triangle?

Back

An acute triangle is a triangle where all three angles are acute (less than 90 degrees).

Front

What is a right triangle?

Back

A right triangle is a triangle that has one right angle (exactly 90 degrees).

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one obtuse angle (more than 90 degrees).