Understanding Circles: Area and Circumference

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

• 2πr

• πr^2

• πd

• πd^2

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CCSS.HSG.GMD.A.1

If the radius of a circle is doubled, by what factor does the area increase?

• 2

• 8

• 16

• 4

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CCSS.HSG.GMD.A.1

CCSS.HSG.SRT.A.1

If a circle has a diameter of 20 mm, what is its radius?

• 40 mm

• 5 mm

• 20 mm

• 10 mm

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CCSS.HSG.GPE.A.1

How do you find the circumference of a circle?

• πr^2

• πd

• 2πr

• πd^2

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CCSS.HSG.GMD.A.1

CCSS.HSG.C.B.5

What is the formula for the circumference of a circle using the diameter?

• πr

• r^2π

• 2πr

• πd

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CCSS.HSG.GMD.A.1

What is the area of a circle with a radius of 12 feet?

• 144 feet squared

• 452.16 feet squared

• 24 feet squared

• 75.36 feet squared

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CCSS.HSG.GMD.A.1

What is the circumference of a circle with a diameter of 9 meters?

• 28.26 meters

• 14.13 meters

• 63.6 meters

• 56.52 meters

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CCSS.HSG.GMD.A.1

How long will the gold rim need to be for a circular lid with a radius of 7 cm?

• 28 cm

• 14 cm

• 22 cm

• 43.96 cm

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CCSS.HSG.GMD.A.1

What is the difference in circumference between Circle A (diameter 18 feet) and Circle B (diameter 24 feet)?

• 30.84 feet

• 24.84 feet

• 12.84 feet

• 18.84 feet

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CCSS.HSG.GMD.A.1

What is the area that Miguel will cover with frosting on the donut?

• 31.4 inches squared

• 3.14 inches squared

• 28.26 inches squared

• 25.12 inches squared

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CCSS.HSG.GMD.A.1