Classifying Triangles by Angles and Sides

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 an isosceles triangle?

Back

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

Front

How many congruent sides does an isosceles triangle have?

Back

An isosceles triangle has 2 congruent sides.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle that has all sides of different lengths.

Front

What is an equilateral triangle?

Back

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

Front

What is the sum of the angles in a triangle?

Back

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

Front

What is a right triangle?

Back

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