Circumference and Area of Circle 22/7 for Pi

Find the area of a circle whose radius is 21 cm.

What does this symbol represent?

• a letter from the English alphabet

• a greek letter

• pie

• pi

Which fraction is a good approximation for pi?

• 22/3

• 22/9

• 22/7

• 22/5

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

A circle has a diameter of 8cm. Find the circumference of the circle.

• 25.12 cm

• 4 cm

• 16 cm

• None of the above

The distance around a circle

• area

• diameter

• circumference

• radius

the ratio of a circles circumference to its diameter

• area

• circumference

• pi

• radius

PI equals

• 22/7

• 3.14...

• both

• neither

What is the formula for the circumference of a circle?

• C=2πr2

• C= π

• C=πr2

• C=πd

Find the circumference of a circle with a diameter of 10 m.

• 31.4 m

• 314 m

• 3.14 m

• 3140 m