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°), Obtuse (more than 90°).

Front

What is an acute triangle?

Back

A triangle where all three angles are acute.

Front

What is a right triangle?

Back

A triangle that has one right angle.

Front

What is an obtuse triangle?

Back

A triangle that has one obtuse angle.

Front

What is an isosceles triangle?

Back

A triangle with at least two congruent sides.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.

Front

How many sides does a triangle have?

Back

A triangle has three sides.

Front

What is the sum of the angles in a triangle?

Back

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

Front

What is a congruent side?

Back

Sides that are equal in length.