Triangles and Angles Review

Front

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

Back

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

Front

What is the definition of similar triangles?

Back

Similar triangles are triangles that have the same shape but may differ in size. Their corresponding angles are congruent, and their corresponding sides are proportional.

Front

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

Back

It is a right triangle.

Front

What is the relationship between complementary angles?

Back

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

Front

What is the relationship between supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

If m∠A = 50 degrees and m∠B = 60 degrees, what is m∠C in triangle ABC?

Back

m∠C = 70 degrees (since 180 - 50 - 60 = 70).

Front

What is the definition of congruent angles?

Back

Congruent angles are angles that have the same measure.

Front

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

Back

To find the measure of a missing angle in a triangle, subtract the sum of the known angles from 180 degrees.

Front

What is the exterior angle theorem?

Back

The exterior angle theorem states that the measure of an exterior angle is equal to the sum of the measures of the two non-adjacent interior angles.

Front

If two angles are vertical angles, what can be said about their measures?

Back

Vertical angles are congruent, meaning they have the same measure.