4.1 Classifying Triangles

Front

What is an equilateral triangle?

Back

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

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 is an acute triangle?

Back

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

Front

What is an obtuse triangle?

Back

A triangle that has one angle greater than 90 degrees.

Front

What is a right triangle?

Back

A triangle that has one angle equal to 90 degrees.

Front

What is an equiangular triangle?

Back

A triangle where all three angles are equal, which also makes it equilateral.

Front

How do you classify triangles by sides?

Back

Triangles can be classified as equilateral, isosceles, or scalene based on the lengths of their sides.

Front

How do you classify triangles by angles?

Back

Triangles can be classified as acute, obtuse, right, or equiangular based on their angles.

Front

What is the sum of the angles in any triangle?

Back

The sum of the interior angles in any triangle is always 180 degrees.