Using Complementary Angles to Find Unknown Angle Measures

This video tutorial teaches how to solve for unknown angle measures using complementary angles. It begins with an introduction to the concept and highlights common mistakes, such as incorrect addition in angle equations. The tutorial explains complementary angles, emphasizing that they add up to 90 degrees, and provides examples to illustrate the concept. By the end, viewers will understand how to solve for unknown angles by applying the principle of complementary angles.

What is the correct method to solve the equation 12 degrees plus x equals 90 degrees?

• Add 12 degrees to both sides

• Subtract 12 degrees from both sides

• Multiply both sides by 12

• Divide both sides by 12

If a line is drawn at an 81-degree angle from the corner of a 90-degree paper, what is the measure of the angle needed to complete the right angle?

• 90 degrees

• 9 degrees

• 81 degrees

• 99 degrees

What is the sum of two complementary angles?

• 60 degrees

• 90 degrees

• 45 degrees

• 180 degrees

If one angle measures 43 degrees, what is the measure of its complementary angle?

• 47 degrees

• 43 degrees

• 53 degrees

• 37 degrees

Which of the following statements is true about complementary angles?

• They are always acute angles

• They add up to 90 degrees

• They are always equal

• They add up to 180 degrees