Classifying Triangles

Front

What is a triangle?

Back

A triangle is a three-sided polygon.

Front

What are the three types of angles in triangles?

Back

Acute (less than 90°), Right (exactly 90°), and Obtuse (more than 90°).

Front

What type of triangle has all angles less than 90°?

Back

Acute triangle.

Front

What type of triangle has one angle that is exactly 90°?

Back

Right triangle.

Front

What type of triangle has one angle that is greater than 90°?

Back

Obtuse triangle.

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length and all angles equal to 60°.

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.

Front

How can you identify a right triangle?

Back

It has one angle that measures exactly 90°.

Front

What is the sum of the angles in any triangle?

Back

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