Pi Circles

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

What is the formula to find the circumference of a circle?

• Pi times radius squared

• Two times Pi times diameter

• Two times Pi times radius

• Pi times diameter

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

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

Which of these ratios is the closest approximation of pi?

• 13/4

• 16/5

• 19/6

• 22/7

What are the first six digits of pi?

• 314157

• 3141592

• 31415

• 314159

_____________ is the distance around the circle

• circumference

• center

• radius

• diameter

_____________ is half of the diameter

• circumference

• center

• radius

• diameter

_____________ is twice the radius

• circumference

• center

• radius

• diameter