Finding Missing Angle Measurements Using Complementary and Supplementary Angles

This lesson covers how to find angle measurements using complementary and supplementary angles. It explains right angles, complementary angles, and supplementary angles, providing problem-solving examples for each. Key concepts include the identification of right angles, the sum of complementary angles being 90 degrees, and supplementary angles being 180 degrees. The lesson also addresses common misunderstandings and offers a mnemonic to differentiate between complementary and supplementary angles.

What is the measure of a right angle?

• 360 degrees

• 90 degrees

• 45 degrees

• 180 degrees

If two angles are complementary and one measures 24 degrees, what is the measure of the other angle?

• 90 degrees

• 156 degrees

• 66 degrees

• 24 degrees

What is the sum of two supplementary angles?

• 360 degrees

• 270 degrees

• 180 degrees

• 90 degrees

If angle ABD is 138 degrees, what is the measure of angle y if they are supplementary?

• 42 degrees

• 48 degrees

• 180 degrees

• 138 degrees

Which mnemonic can help remember that supplementary angles sum to 180 degrees?

• Complementary comes first alphabetically

• Complementary angles form a straight line

• Supplementary and straight both start with 's'

• Supplementary is smaller than complementary