Unit 9 Contents

3. Describe the estimated size of the following angles. Use a square corner or other right angle as a guide.




4. Ana wrote about ∠R in Question 3.
   
         ∠R is a little more than 90°.
   
   Do you agree with Ana? Why or why not?

Using a Protractor

5. Is ∠ABC less than or greater than 90°?
6. Describe the size of ∠ABC.
7. Choose your best estimate for ∠ABC.
   
   30°         120°         70°         90°         89°