Finding the Circumference

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

• C = r²

• C = rd

• A = π·r²

• C = π·d

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CCSS.HSG.GMD.A.1

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

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CCSS.HSG.GMD.A.1

What does C represent in the formula:

C = π·d

• Pi

• Circumference

• Diameter

• Area

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CCSS.HSG.GMD.A.1

What does d represent in the formula:

C = π·d

• diameter

• radius

• pi

• 3.14

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CCSS.HSG.GMD.A.1

What number represents π?

• 31.4

• 4.13

• 3.14

• 34.1

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CCSS.7.G.B.4

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

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CCSS.HSG.C.B.5

CCSS.HSG.GMD.A.1

Find the circumference of the circle.

• 31.4 cm

• 78.5 cm

• 314 cm

• 15.7 cm

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CCSS.HSG.GMD.A.1

Find the circumference of the circle.

• 78.5 cm

• 15.7 cm

• 7.85 cm

• 19.6 cm

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CCSS.HSG.GMD.A.1

Find the circumference of the circle.

• 18.8 cm

• 113 cm

• 37.7 cm

• 452.2 cm

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CCSS.HSG.GMD.A.1

Find the circumference of the circle.

• 38.47 cm

• 10.99 cm

• 43.96 cm

• 21.98 cm

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CCSS.HSG.GMD.A.1