Circumference

What does "circumference" mean?

• Space a circle takes up

• Distance around a circle

• Line from one side of a circle to another

• Line from center of circle to side

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

Find the circumference of the circle.

Round to the nearest tenth.

• 31.4 cm

• 78.5 cm

• 314 cm

• 15.7 cm

Find the circumference of the circle.

Round to the nearest tenth.

• 78.5 cm

• 15.7 cm

• 7.85 cm

• 19.6 cm

Find the circumference of the circle.

Round to the nearest hundredth.

• 38.47 cm

• 10.99 cm

• 43.96 cm

• 21.99 cm

Find the circumference of the circle.

Round to the nearest hundredth.

• 14.13 cm

• 63.56 cm

• 28.27 cm

• 127.17 cm

What is the radius of this circle?

• 6

• 4

• 3

• 0

what is the diameter of this circle?

• 10

• 5

• 20

• 50