Circumference of a Circle

What is the formula to calculate the circumference of a circle?

• d/2π

• πr

• πd

• π/2r

If the radius of a circle is 5 cm, what is its circumference?

• 31.4 cm

• 25 cm

• 10 cm

• 15.7 cm

If the diameter of a circle is 12 cm, what is its circumference?

• 18 cm

• 24 cm

• 37.68 cm

• 30 cm

What is the circumference of a circle with a radius of 8 cm? (Use π = 3.14)

• 12.56 cm

• 50.24 cm

• 25.12 cm

• 100.48 cm

What is the circumference of a circle with a diameter of 10 cm? (Use π = 3.14)

• 20 cm

• 15.7 cm

• 31.4 cm

• 25.2 cm

If the circumference of a circle is 18π cm, what is its radius?

• 15 cm

• 12 cm

• 9 cm

• 6 cm

If the circumference of a circle is 36 cm, what is its diameter?

• 30 cm

• 24 cm

• 11.46 cm

• 18 cm

What is the circumference of a circle with a radius of 6.5 cm? (Use π = 3.14)

• 40.82 cm

• 25.12 cm

• 12.56 cm

• 33.33 cm

What is the circumference of a circle with a diameter of 14.2 cm? (Use π = 3.14)

• 28.4 cm

• 56.8 cm

• 112.4 cm

• 44.708 cm

If the circumference of a circle is 50.24 cm, what is its radius? (Use π = 3.14)

• 12

• 15

• 10

• 8