Circumference

If my diameter is 90cm, what is my circumference?

• 90π cm

• 180π cm

• 45π cm

• 56π cm

What is the formula for finding the circumference of a circle?

• C = r²

• C = rd

• A = π·r²

• C = π·d

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

What does C represent in the formula: C = π·d

• Pi

• Circumference

• Diameter

• Area

Circle A has a radius of 21 meters. What is its circumference?

• 131.88

• 65.94

• 207.05

• 103.53

What does d represent in the formula:

C = π·d

• diameter

• radius

• pi

• 3.14

What is CB?

• diameter

• center

• circumference

• radius

If my circumference is 16π ft, what is my radius?

• 8 ft

• 16 ft

• 25.12 ft

• 50.24 ft

If my circumference is 12π cm, what is my diameter?

• 12 cm

• 118.3152 cm

• 6 cm

• 37.68 cm

If my circumference is 10π in, what is my diameter?

• 10 in

• 5 in

• 3.14 in

• 31.4 in