Parts of Circle and Pi

Which is just an estimate or approximation of pi?

• 22/7

• pi

• C/D

• 3

If the diameter is 18 feet, what is the radius?

• the same

• twice what the diameter is

• half of what the diameter is

• the radius times the radius

If the radius is 6, what is the diameter?

• 12

• 3

• 6²

• 6

If the diameter of a circle is 50 yards, the radius is _____

• 100 yards

• 25 yards

• 150 yards

• 15 yards

Name the pictured part of the circle.

• Diameter

• Sector

• Radius

• Central Angle

• Arc

Match the following part of the circle with its correct label.

• Tangent Line

• Radius

• Diameter

• Chord

• Point S

• Center

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

• circumference  &  the diameter 

• diameter  &  the radius 

• any two parts of the circle 

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)

_diameter?

• 5 in

• 10 in

• 3.14 in

• 2.5