Circles in Terms of Pi

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A circle has a diameter of 4 cm. What is its circumference?

• 4π cm

• 2π cm

• 8π cm

• 16π cm

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A circle has a radius of 9 cm. What is its circumference?

• 9π cm

• 18π cm

• 4.5π cm

• 81π cm

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A circle has a radius of 5 cm. What is its area?

• 50π cm²

• 10π cm²

• 25π cm²

• 5π cm²

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A circle has a circumference of 40π inches. What is its diameter?

• 10 in

• 20 in

• 80 in

• 40 in

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A circle has an area of 16π in². What is its radius?

• 32 in

• 16 in

• 4 in

• 2 in

A circle has a diameter of 12 ft. What is its area?

• 12π ft²

• 6π ft²

• 72π ft²

• 36π ft²

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A circle has a circumference of 28π inches. What is its radius?

• 28 in

• 14 in

• 56 in

• 7 in

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A circle has a circumference of 18π feet. What is its area?

• 81π ft²

• 18π ft²

• 9π ft²

• 36π ft²

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On a scale of 1 (didn't help me learn at all) to 4 (helped me learn a lot), how much did this Quizizz help you learn about using pi in circle calculations? Explain.

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