Classifying Triangles by Sides and Angles

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length and all three angles measuring 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 a right triangle?

Back

A triangle that has one angle measuring 90 degrees.

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 measuring more than 90 degrees.

Front

How can you identify an equilateral triangle?

Back

By checking if all three sides are equal and all angles are 60 degrees.

Front

How can you identify an isosceles triangle?

Back

By checking if at least two sides are equal and the angles opposite those sides are equal.

Front

How can you identify a scalene triangle?

Back

By checking if all three sides are of different lengths.

Front

What is the relationship between right triangles and equilateral triangles?

Back

A right triangle cannot be equilateral because an equilateral triangle has all angles equal to 60 degrees.