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# Find the circumference of each circle given its radius or diameter

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Find the circumference of each circle given its radius or diameter. (Round your answers to two decimal places.)

(a) d = 18 in

________ in

(b)  r = 7 m

_______ m

(c) 10 cm

_______ cm

(d) 4.5 ft

_____ ft

Find the circumference of each circle given its radius or diameter. (Round your answers to two decimal places.)

Sep 2, 2018

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The formula for circumference is $$d\pi$$.

a) $$d = 18$$, so your circumference would be $$18\pi$$ inches. Since it is asking to round your answer, we need to multiply $$18$$ by $$\pi$$, which rounds to $$56.55$$ inches.

b) If $$r = 7$$$$d = 14$$. Your circumference would be $$14\pi$$ which equals $$43.98$$ m.

c) If $$10$$ is the diameter, your circumference would be $$10\pi = 31.42$$ cm. If $$10$$ is the radius, your circumference would be $$20\pi = 62.83$$ cm.

d) If $$4.5$$ is your diameter, your circumference would be $$4.5\pi = 14.14$$ feet. If $$4.5$$ is your radius, your circumference would be $$9\pi = 28.27$$ feet.

- Daisy

Sep 2, 2018