Circumference and Area of Circles

If you are going to paint the entire center circle of a basketball court, do you need to know the area or circumference of the circle?

• Area

• Circumference

• Neither

The homeowners association wants to enclose a circular playground in a fence. The need to find the amount of fencing they need to purchase.  Will they need the area or circumference of the playground?

• area

• circumference

• neither

What is the radius of the circle in the image?

• 6

• 2

• 3

• 12

What does π equal?

• 3

• 3.14

• 3.2

• 21/7

What is π ? (Best Choice)

• The ratio of the circumference of any circle to its diameter.

• Exactly 3.14

• Exactly 3.1415

• Exactly 3.141593

A Circle has a radius of 4.  What is the circumference of the circle? (Best Choice)

• 4π or about 12.56

• 16π or about 50.24

• 2π or about 6.28

• 8π or about 25.12

A Circle has a radius of 6 inches.  What is the circumference of the circle? (Best Choice)

• 3π or about 9.42 in

• 6π or about 18.84 in

• 12π or about 37.68 in

• 36π or about 113.04 in 

What is the area of the circle? (Best Choice)

• 5π or about 15.7 cm²

• 10π or about 31.4 cm²

• 25π or about 78.5 cm²

• 100π or about 314 cm² 

A Circle has a radius of 12 inches.  What is the area of the circle? (Best Choice)

• 24π or about 75.36 in²

• 12π or about 37.68 in²

• 144π or about 452.16 in²

• 576π or about 1,808.64 in² 

A Circle has a radius of 12 inches.  What is the circumference of the circle? (Best Choice)

• 24π or about 75.36 in

• 12π or about 37.68 in

• 144π or about 452.16 in

• 576π or about 1,808.64 in