Angles and Triangles

Front

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

Back

180 degrees.

Front

What is the name of a triangle with all sides of different lengths?

Back

Scalene triangle.

Front

If one angle of a triangle measures 30 degrees, and another angle measures 60 degrees, what is the measure of the third angle?

Back

The measure of the third angle is 90 degrees.

Front

What is the name of a triangle with one angle measuring more than 90 degrees?

Back

Obtuse triangle.

Front

If one angle of a triangle measures 60 degrees, and another angle measures 80 degrees, what is the measure of the third angle?

Back

The measure of the third angle is 40 degrees.

Front

What is an acute triangle?

Back

A triangle where all angles are less than 90 degrees.

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length.

Front

What is a right triangle?

Back

A triangle with one angle measuring exactly 90 degrees.

Front

What is the exterior angle theorem?

Back

The exterior angle of a triangle is equal to the sum of the two opposite interior angles.