Pi for Circle

The distance around a circle

• Diameter

• Radius

• Circumference

• Area

Ahmed measured the diameter (d) and circumference (C) of a circle accurately to the nearest mm, with the results:

d = 113 mm

C = 355 mm

He then used his measurements to calculate a value for π correct to 7 decimal places. What value did he get?

• 3.1415926

• 3.1415927

• 3.1415928

• 3.1415929

To mathematically calculate the special number "pi" you need the __________________________.  

• circumference  &  the diameter 

• diameter  &  the radius 

• any two parts of the circle 

What is the best way to find pi?

• 3.1415...

• 22/7

• C/D

• 20 x 3.1415...

Which is just an estimate or approximation of pi?

• 22/7

• pi

• C/D

• 3

Determine the radius of the penny

• 59.66 mm

• 9.5 mm

• 38 mm

• 119.32 mm

The number pi is approximately equal to _________. 

• 3.14

• 3

• whatever the diameter equals 

The number pi ________________

• has only 3 digits

• never ends  &  never repeats 

• ends eventually
  (it is just a really long number)

what is the symbol for pi

• £

• π

• Π

• •

Th distance around the circular cake is 9.42 inches. The distance across the cake is 3 inches. What happens when you divide 9.42 by 3?

• You get the area of the circle

• You get pi

• You get the diameter of the circle