Pi and Diameter of Circle

What is the circumference of a pizza with a 10-inch diameter?

• 31.40

• 28.26

• 25.12

• 18.86

What is the approximate numerical value of this sign?

• 3.11

• 3.14

• 4.13

• 6.28

Find Circumference.

• 87.92 cm

• 43.96 cm

• 21.98 cm

• 3.14 cm

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

What is the circumference of this circle?

• 37.68

• 6.28

• 21.25

• 18.84

What is the circumference of this circle?

• 25.12

• 47.10

• 40.82

• 31.40

Mia's bike has wheels with 14 inch diameters. What is the circumference of each wheel?

• 6.28

• 34.54

• 43.96

• 28.26

A dinner plate has a radius of 6 centimeters. What is the circumference?

• 6.28

• 18.84

• 37.68

• 43.96

In words, describe this formula

• The area of a circle is equal to pi times the radius squared

• The circumference of a circle is equal to the pi times the diameter.

• The circumference of a circle is equal to pi times the radius squared

• The area of a circle is equal to pi times the diameter

If my radius is 10ft, what is my diameter?

• 20ft

• 5ft

• 31.4ft

• 62.8ft