Q1:

A circle has a radius of 9 cm.
What is its diameter?

A. 3 cm B. 18 cm C. 6 cm D. 4.5 cm 
Answer 1:


Q2:

Which of the following can be used as approximations for pi?

A. ^{}B. 3.1^{}C. 3.14^{}D. all of the above 
Answer 2:


Q3:

If the diameter of a circle is 12 metres, what is the radius? 
A. 24 m B. 6 m C. 36 m D. 6 cm 
Answer 3:


Q4:

What is the radius of the circle?

A. 3.75 cm^{}B. 28.5 cm^{}C. 4.75 cm^{}D. 19 cm 
Answer 4:


Q5:

What is the circumference of the circle above?
Use π = 3.1
Remember: Circumference = pi x diameter

A. 29.45 cm B. 24.8 m C. 32 m D. 99.2 m 
Answer 5:


Q6:

What is the area of the circle above?
Use π= 3.1 and give answer to one decimal place.
Remember: Area = pi x radius x radius

A. 29.5 cm^{2} B. 58.9 cm^{2} C. 69.9 cm^{2} D. 559.6 cm^{2} 
Answer 6:


Q7:

Which of the following units could be used to measure the circumference of a circle? 
A. tonnes B. kilometres C. litres D. hectares 
Answer 7:


Q8:

If the circumference of a circle is 24.8 cm, what is its diameter?
Remember: Circumference = pi x diameter

A. 2 cm B. 4 cm C. 8 cm D. 16 cm 
Answer 8:


Q9:

What mathematical name best describes a tennis ball?

A. cylinder B. cube^{}C. sphere^{}D. circle 
Answer 9:


Q10:

If the radius of a circle is doubled, how many times greater is its area? 
A. 4 B. 2 C. 16 D. 8 
Answer 10:

