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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
 #1
avatar+391 
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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

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