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8.4 Area & Circumference of Circles

Last updated over 3 years ago

11 Nsɛmmisa

Hyɛ no nsow a efi ɔkyerɛwfo no hɔ:

TEKS 7.9B, 7.5B

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7.5.B

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7.9.B

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7.9.B

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7.9.B

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7.9.B

Asemmisa {{asɛmmisaAhyɛnsode}}

1.

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2.

Find the circumference of the circle. Round your answer to the nearest tenth.

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3.

Find the area of the circle. Round your answer to the nearest tenth.

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4.

A spotlight can be adjusted to effectively light a circular area of up to 6 meters in diameter. To the nearest tenth, what is the maximum area that can be effectively lit by the spotlight?

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5.

The world’s largest flower, the Giant Rafflesia, is 91 centimeters in diameter. Use a calculator to determine the circumference of a Giant Rafflesia to the nearest tenth.

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6.

The bull’s eye on an archery target has a radius of 3 inches. The entire target has a radius of 9 inches. To the nearest tenth, determine the area of the target outside of the bull’s eye.

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7.

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8.

Determine the area of a semicircle with a diameter of 28 cm. Use 3.14 for π. Round to the nearest tenth if necessary.

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9.

A mountain bike wheel has a radius of 13 inches. How many feet will the bike travel in 7 revolutions? Round to the nearest tenth of a foot.

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10.

A welcome mat in front of the hardware store is a half-circle. The straight side of the mat is 24 inches. What is the perimeter of the mat? Round to the nearest inch.

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11.

A Ferris wheel has a circumference of 89.49 feet. What is the approximate radius of the Ferris wheel to the nearest hundredth of a foot? Use 3.14 for \pi.