Circle, Area and Circumference Involving Pi

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

What is the diameter of the circle in the image?

• 10

• 20π

• 20

• 100

What is the formula for finding the area of a circle?

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A circle as a circumference of 36π meters. What is the radius of the circle?

• 36 meters

• 6 meters

• 12 meters

• 18 meters

If the radius of a circle is 12.5 meters, the diameter is ____

• 6.25 meters

• 125 meters

• 25 meters

• 50 meters

What is the radius of this circle?

• 12cm

• 6cm

• 24cm

• 3cm

Find the area of the circle below.

• 113.04 cm units²

• 18.84 cm units²

• 9 cm units²

• 28.26 cm units²

Find the circumference (to the nearest whole number)

• 88 in

• 44 in

• 116 square in

• None of the above

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

• 11.32 ft

• 12.25 ft

• 10.99 ft

• 8.75 ft

Ms. Merine calculated that her hoop earring has a diameter of 3.5 centimeters. What is the area of her earring (round to the hundreth's place)?

• 9.25 cm²

• 9.62 cm²

• 9.15 cm²

• 9.99 cm²