Classifying Triangles and Triangle Sum Theorem FLASHCARD

Front

What is the Triangle Sum Theorem?

Back

The Triangle Sum Theorem states that the sum of the interior angles of 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

What type of triangle has all sides of equal length?

Back

Equilateral triangle.

Front

What type of triangle has two sides of equal length?

Back

Isosceles triangle.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle with no congruent sides.

Front

If two angles in a triangle are 45 degrees and 75 degrees, what is the measure of the third angle?

Back

60 degrees.

Front

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

Back

Each angle measures 60 degrees.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle greater than 90 degrees.

Front

What is the relationship between the angles in a right triangle?

Back

One angle is 90 degrees, and the sum of the other two angles is 90 degrees.