Triangles and Angles

Front

What is the sum of the angles in a triangle?

Back

180 degrees.

Front

If two angles of a triangle are 30 degrees and 70 degrees, what is the measure of the third angle?

Back

80 degrees.

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

If angle A is 25 degrees and angle B is x degrees, and they are complementary, what is x?

Back

x = 65 degrees.

Front

If angle A is 120 degrees and angle B is x degrees, and they are supplementary, what is x?

Back

x = 60 degrees.

Front

What is an acute triangle?

Back

A triangle where all angles are less than 90 degrees.

Front

What is an obtuse triangle?

Back

A triangle with one angle greater than 90 degrees.

Front

What is a right triangle?

Back

A triangle with one angle equal to 90 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.