Circles Circumferences

Find the circumference of a circle with a radius of 13.5 mm.

• 37.68mm

• 18.84mm

• 84.78 mm

• none of the above

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's approximate circumference?

• 3 m 

• 9.42 m

• 12 m

• 18.84 m

Find the circumference of a circle with a diameter of 11 millimeters.

• 34.6 mm

• 30 mm

• 25.3 mm

• 34.54 mm

The circumference is 62.8 inches.  What is the radius?

• 20 inches

• 10 inches

• 6.28 inches

• 31.4 inches

Here is a picture of a Ferris wheel. It has a diameter of 80 meters.How far does a rider travel in three complete rotations around the Ferris wheel?

• 753.6 meters

• 251.2 meters

• 125.6 meters

• 376.8 meters

• 7.85 ft

• 15.7 ft

• 19.63 ft

• 31.4 ft

Find the exact circumference of the circle using the given circumscribed polygon.

• 11π yd

• 11 yd

• 25π cm

• 11√2π cm

• F

• G

• H

• J

A circle has a diameter of 4.5 cm. A larger circle has a diameter of 24 cm. What is the approximate difference in the circumferences of the two circles?

• 19.5 cm

• 28.5 cm

• 61 cm

• 90 cm

What does π equal?

• 3

• 3.14

• 3.2

• 21/7