8th Grade - Illustrative Math 1.9

Front

What is the sum of the angles in a triangle?

Back

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

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

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

Back

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

Front

What is the definition of complementary angles?

Back

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

Front

What is the definition of supplementary angles?

Back

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

Front

If one angle measures 70 degrees, what is the measure of its complement?

Back

The measure of its complement is 20 degrees (90 - 70 = 20).

Front

If one angle measures 135 degrees, what is the measure of its supplement?

Back

The measure of its supplement is 45 degrees (180 - 135 = 45).

Front

What is the measure of Angle G?

Back

Angle G measures 129 degrees.