Classifying Triangles

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle with all sides of different lengths.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle with two sides of the same length.

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle with all three sides of the same length.

Front

What is an acute triangle?

Back

An acute triangle is a triangle where all 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

How do you classify triangles by sides?

Back

Triangles can be classified by sides as scalene (0 sides the same), isosceles (2 sides the same), or equilateral (3 sides the same).

Front

How do you classify triangles by angles?

Back

Triangles can be classified by angles as acute (all angles < 90°), right (1 angle = 90°), or obtuse (1 angle > 90°).

Front

Example of a scalene triangle:

Back

A triangle with sides measuring 3 cm, 4 cm, and 5 cm.

Front

Example of an isosceles triangle:

Back

A triangle with two sides measuring 5 cm and one side measuring 3 cm.