Classify Triangles and Missing Angles

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is an acute triangle?

Back

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

Front

What is an equilateral triangle?

Back

A triangle where all three sides are of equal length and all angles are 60 degrees.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.

Front

What is an obtuse triangle?

Back

A triangle that has one angle greater than 90 degrees.

Front

Can a triangle be scalene and equiangular?

Back

No, a scalene triangle cannot be equiangular because equiangular triangles have all angles equal.

Front

What is the sum of the angles in a triangle?

Back

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

Front

If one angle of a triangle is 90 degrees, what type of triangle is it?

Back

It is a right triangle.

Front

How do you find the measure of a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the classification of a triangle with angles measuring 36°, 85°, and 59°?

Back

It is an acute triangle.