Classifying Triangles

Front

What is a triangle classified by its angles?

Back

A triangle can be classified as acute (all angles less than 90°), right (one angle equal to 90°), or obtuse (one angle greater than 90°).

Front

What is a triangle classified by its sides?

Back

A triangle can be classified as scalene (all sides of different lengths), isosceles (two sides of equal length), or equilateral (all sides of equal length).

Front

What is an acute triangle?

Back

An acute triangle is a triangle where all three angles are less than 90°.

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle equal to 90°.

Front

What is an obtuse triangle?

Back

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

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle where all three sides are of equal length and all angles are equal to 60°.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle where all three sides are of different lengths.

Front

What does equiangular mean in relation to triangles?

Back

Equiangular means that all angles in the triangle are equal, which also makes it equilateral.

Front

How can you classify a triangle that is both acute and isosceles?

Back

It is classified as an acute isosceles triangle.