Pi as a Ratio

3 in

3.14 in

9 in

9.42 in

• 3 in

• 3.14 in

• 9 in

• 9.42 in

18 mm

66.56 mm

126 mm

226.08 mm

• 18 mm

• 66.56 mm

• 126 mm

• 226.08 mm

A Ferris wheel has a circumference of 89.49 feet. What is the approximate radius of the Ferris wheel? Use 3.14 for π.

• 14.25 ft

• 17.40 ft

• 28.5 ft

• 31.45 ft

Which of these ratios is the closest approximation of pi?

• 13/4

• 16/5

• 19/6

• 22/7

• Multiply the circumference by the diameter

• Divide the circumference by the diameter

• Add the circumference to the diameter

• Subtract the diameter from the circumference

• Diameter / Circumference

• Circumference / Radius

• Radius / Circumfrence

• Circumference / Diameter

• 3.14

• 2.71

• 1.41

• 4.13

What does this symbol represent?

• a letter from the English alphabet

• a greek letter

• pie

• pi

What do you get when you divide the circumference of a Jack-o-Lantern by its diameter?

• Pumpkin

• Jack-o-Lantern

• Pumpkin Pi

• Pi in the Sky

Pi is the ratio of a circle’s _________ to _________. 

• radius/diameter

• circumference/diameter

• area/circumference

• circumference/radius