Ratio of Circumference to Diameter

______________ is twice the radius

• circumference

• radius

• center

• diameter

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

What is the "formal" definition of pi?

• 22/7

• 3.1415926

• the ratio of a circle's circumference to its diameter

• the surface area of a sphere of diameter 22/7

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

• radius/diameter

• circumference/diameter

• area/circumference

• circumference/radius

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

Which of these ratios is the closest approximation of pi?

• 13/4

• 16/5

• 19/6

• 22/7

What number is pi?

• 41

• 00

• 3.14

• 5.14

Another use for pi?

• circumference of a circle

• desert after dinner

• triangle bisect line

• square root

The equation C = πd, is used to find the circumference of a circle given it's diameter. This formula can be rearranged to solve for pi. Which equation is written correctly to solve for pi?

• π = Cd

• π = C ÷ d

• π = d ÷ c

• π = C - d