Classifying Triangles

Front

What is a triangle?

Back

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°), Obtuse (greater than 90°).

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length and all 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

How do you classify a triangle with one angle greater than 90°?

Back

It is classified as an obtuse triangle.

Front

How do you classify a triangle with one angle equal to 90°?

Back

It is classified as a right triangle.

Front

What is an acute triangle?

Back

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

Front

What is the sum of the interior angles of a triangle?

Back

The sum is always 180°.

Front

What is an equiangular triangle?

Back

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