Classifying Triangles

Front

What is a triangle?

Back

A triangle is a polygon with three edges and three vertices.

Front

What are the three types of angles in triangles?

Back

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

Front

What is an isosceles triangle?

Back

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

Front

What is a scalene triangle?

Back

A scalene triangle has all sides of different lengths.

Front

What is an equilateral triangle?

Back

An equilateral triangle has all three sides equal and all angles measuring 60°.

Front

How many degrees are in the sum of the angles of a triangle?

Back

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

Front

What is a right triangle?

Back

A right triangle has one angle that measures exactly 90°.

Front

What is an obtuse triangle?

Back

An obtuse triangle has one angle that is greater than 90°.

Front

What is an acute triangle?

Back

An acute triangle has all angles measuring less than 90°.

Front

What does it mean for triangles to be congruent?

Back

Congruent triangles are triangles that are identical in shape and size.