Circumference of a Circle

What is the formula to find the circumference of a circle given the radius?

• C=πr

• C=r²

• C=2r

• C=2πr

Tags

CCSS.7.G.B.4

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

• 20π cm

• 10π cm

• 15π cm

• 25π cm

Tags

CCSS.7.G.B.4

What is the formula to find the circumference of a circle given the diameter?

• C = 2d

• C = πd

• C = d²

• C = πr

Tags

CCSS.7.G.B.4

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

• 24π cm

• 6π cm

• 3π cm

• 12π cm

Tags

CCSS.7.G.B.4

If the radius of a circle is 8 cm, what is its circumference?

• 4π cm

• 64π cm

• 32 cm

• 16π cm

Tags

CCSS.7.G.B.4

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

• 36π cm

• 10π cm

• 18π cm

• 9π cm

Tags

CCSS.7.G.B.4

If the radius of a circle is 3.5 cm, what is its circumference?

• 3.5π cm

• 21π cm

• 10π cm

• 7π cm

Tags

CCSS.7.G.B.4

If the radius of a circle is 15 cm, what is its circumference?

• 15π cm

• 30π cm

• 7.5π cm

• 45π cm

Tags

CCSS.7.G.B.4

If the radius of a circle is 9 cm, what is its circumference?

• 18π cm

• 4.5π cm

• 36π cm

• 9π cm

Tags

CCSS.7.G.B.4

If the diameter of a circle is 2.5 cm, what is its circumference?

• 1.25π cm

• 5π cm

• 2.5 cm

• 2.5π cm

Tags

CCSS.7.G.B.4