Unit Test #19

Select your answers to the following 10 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.

Use pi = 3.1 for all calculations





Which of the following can be used as approximations for pi ? A. 
C. 3.14
D. all of the above

Answer 1:





A circle has a radius of 6 cm.

What is its circumference?

A. 111.6 cm
B. 37.2 cm
C. 18.6 cm
D. 3.14 cm

Answer 2:





If the radius of a circle is 12 cm, what is the diameter? A. 24 cm
B. 37.2 cm
C. 4 cm
D. 6 cm

Answer 3:





What is the radius of the circle?

A. 16 m
B. 49.6 m
C. 32 m
D. 8 m

Answer 4:





What is the circumference of the circle above? A. 49.6 m
B. 24.8 m
C. 32 m
D. 99.2 m

Answer 5:





What is the area of the circle above? A. 793.6 m2
B. 49.6 m2 
C. 198.4 m2
D. 99.2 m2

Answer 6:





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

Answer 7:





If the circumference of a circle is 24.8 cm, what is its diameter? A. 2 cm
B. 4 cm
C. 8 cm
D. 16 cm

Answer 8:





The area of a circle is given as 151.9 m2.

What is its radius?

A. 7 cm
B. 14 cm
C. 28 cm
D. 49 cm

Answer 9:





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

Answer 10: