Classifying Triangles

Front

What is a triangle?

Back

A polygon with three edges and three vertices.

Front

What are the three main types of triangles based on side lengths?

Back

Equilateral, Isosceles, Scalene.

Front

What is an Equilateral triangle?

Back

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

Front

What is an Isosceles triangle?

Back

A triangle with at least two sides of equal length and the angles opposite those sides are equal.

Front

What is a Scalene triangle?

Back

A triangle with all sides of different lengths and all angles of different measures.

Front

What are the three main types of triangles based on angles?

Back

Acute, Right, Obtuse.

Front

What is an Acute triangle?

Back

A triangle where all three angles are less than 90°.

Front

What is a Right triangle?

Back

A triangle that has one angle exactly equal to 90°.

Front

What is an Obtuse triangle?

Back

A triangle that has one angle greater than 90°.

Front

What is a Right Isosceles triangle?

Back

A triangle that has one right angle and two sides of equal length.