Classifying Triangles, Triangle Sum, Exterior Angles 2

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 greater than 90 degrees.

Front

What is an equiangular triangle?

Back

A triangle where all three angles are equal, each measuring 60 degrees.

Front

What is a right triangle?

Back

A triangle that has one angle equal to 90 degrees.

Front

What is the Triangle Sum Theorem?

Back

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

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle measures 60 degrees.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always congruent.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What is the Exterior Angle Theorem?

Back

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

Front

What is an isosceles triangle?

Back

A triangle that has at least two sides of equal length.