Classifying Triangles

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 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 right angle?

Back

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

Front

What is a straight angle?

Back

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

Front

What is an isosceles triangle?

Back

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

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle in which all three sides are of different lengths.

Front

What is an equilateral triangle?

Back

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

Front

If a triangle has all angles less than 90°, what type of triangle is it?

Back

It is an acute triangle.

Front

If a triangle has one angle greater than 90°, what type of triangle is it?

Back

It is an obtuse triangle.

Front

If a triangle has two equal angles, what type of triangle is it?

Back

It is an isosceles triangle.