Circumferences and Areas of Circles

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

• C = r²

• C = rd

• A = π·r²

• C = π·d

Tags

CCSS.7.G.B.4

Find the circumference of the circle.

• 31.4 cm

• 78.5 cm

• 314 cm

• 15.7 cm

Tags

CCSS.7.G.B.4

Find the circumference of the circle.

• 38.47 cm

• 10.99 cm

• 43.96 cm

• 21.98 cm

Tags

CCSS.7.G.B.4

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

• Pi

• Circumference

• Diameter

• Area

Tags

CCSS.7.G.B.4

What does d represent in the formula:

C = π·d

• diameter

• radius

• pi

• 3.14

Tags

CCSS.7.G.B.4

What number represents π?

• 31.4

• 4.13

• 3.14

• 34.1

Tags

CCSS.HSG.GMD.A.1

What is the circumference of a circle?

• the distance around a circle

• the area of a circle

• halfway through a circle

• a line through the center of a circle

If my radius is 10ft, what is my diameter?

• 20ft

• 5ft

• 31.4ft

• 62.8ft

Tags

CCSS.7.G.B.4

If my circumference is 50.24ft, what is my radius?

• 8ft

• 16ft

• 25.12ft

• 50.24ft

Tags

CCSS.7.G.B.4

If my circumference is 37.68cm, what is my diameter?

• 12cm

• 118.3152cm

• 6cm

• 37.68cm

Tags

CCSS.7.G.B.4