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 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

How do you classify a triangle with all sides of different lengths?

Back

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

Front

How do you classify a triangle with two sides of equal length?

Back

A triangle with two sides of equal length is classified as an isosceles triangle.

Front

How do you classify a triangle with all sides of equal length?

Back

A triangle with all sides of equal length is classified as an equilateral triangle.

Front

What type of triangle has one angle greater than 90 degrees?

Back

A triangle with one angle greater than 90 degrees is classified as an obtuse triangle.

Front

What type of triangle has one right angle?

Back

A triangle with one right angle is classified as a right triangle.

Front

What is the sum of the angles in any triangle?

Back

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