Concepts and measurement: Geometric concepts-Angles

The video tutorial explains the concept of complementary angles, which are two angles that add up to 90 degrees. It introduces angle PQS as a right angle and discusses how angles PQR and RQS are complementary. The tutorial provides an example where angle PQR is 30 degrees, and demonstrates how to calculate angle RQS as 60 degrees without using a protractor, by subtracting from 90 degrees.

What is the measure of angle PQS?

• 90°

• 120°

• 45°

• 60°

What term is used to describe two angles that add up to 90°?

• Complementary angles

• Supplementary angles

• Vertical angles

• Adjacent angles

What is the sum of angles PQR and RQS?

• 60°

• 180°

• 120°

• 90°

If angle PQR is 30°, what is the measure of angle RQS?

• 30°

• 45°

• 90°

• 60°

How can you find the measure of angle RQS if you know angle PQR is 30°?

• Use a protractor

• Subtract 30° from 90°

• Multiply 30° by 2

• Add 30° to 90°