Circumference of a Circle

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

• 2πr

• πr^2

• 3πr

• 4πr

Tags

CCSS.7.G.B.4

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

• 15π cm

• 20π cm

• 10π cm

• 25π cm

Tags

CCSS.7.G.B.4

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

• 6π cm

• 12π cm

• 36π cm

• 24π cm

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a radius of 8 cm?

• The circumference of a circle with a radius of 8 cm is 64 cm.

• The circumference of a circle with a radius of 8 cm is approximately 50.27 cm.

• The circumference of a circle with a radius of 8 cm is 100 cm.

• The circumference of a circle with a radius of 8 cm is 16 cm.

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a diameter of 10 cm?

• 31.42 cm

• 20.5 cm

• 8.5 cm

• 15.72 cm

Tags

CCSS.7.G.B.4

If the circumference of a circle is 31.4 cm, what is its radius?

• 10

• 20

• 15

• 5

Tags

CCSS.7.G.B.4

If the circumference of a circle is 62.8 cm, what is its diameter?

• 10 cm

• 25 cm

• 15 cm

• 20 cm

Tags

CCSS.7.G.B.4

What is the ratio of the circumference of a circle to its diameter?

• 3

• 2

• 4

• pi (π)

Tags

CCSS.7.G.B.4

If the circumference of a circle is 25.12 cm, what is its radius?

• 6.28

• 3.99

• 50.24

• 12.56

Tags

CCSS.7.G.B.4

If the circumference of a circle is 37.68 cm, what is its diameter?

• 18 cm

• 6 cm

• 24 cm

• 12 cm

Tags

CCSS.7.G.B.4