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

Back

The measure of the third angle is 60°.

Front

What type of triangle has all three sides of equal length?

Back

An equilateral triangle.

Front

What type of triangle has all three angles equal?

Back

An equiangular triangle.

Front

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

Back

Each angle measures 60°.

Front

What is the definition of a scalene triangle?

Back

A scalene triangle is a triangle with all sides of different lengths.

Front

What is the definition of an isosceles triangle?

Back

An isosceles triangle is a triangle with at least two sides of equal length.

Front

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

Back

Subtract the sum of the known angles from 180°.

Front

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

Back

In a right triangle, one angle measures 90°, and the sum of the other two angles is 90°.

Front

What is the definition of complementary angles?

Back

Complementary angles are two angles whose measures add up to 90°.