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If the circumference of a circle is about 60 in ...

If the circumference of a circle is about 60 in.  What is the diameter to the nearest tenth of an inch?   Also, if the radius of the large circle is 8 in. The radius of each of the smaller circles is 1 in.  Find the area of the shaded region to the nearest unit.  I have no idea where to begin.  I am trying to teach myself a middle aged woman simple math.  I figured it's never too late to learn.  Thanks  


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Jay
4486 answers
1272 helpful answers

Glass sculpture, Chihuly at Grant's Farm; http://www.chihuly.com

Victims of circumstance owe it to fate. Victims of choice owe it to themselves.

C = piD

D = 19.098593

D = 19.1"

The value of pi is about 3.1416

The remainder of your questions require visual data.

Jay
Posted 2009-10-20T03:47:25Z
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25 answers
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Regarding the Circle & Circles are fun!

Circumference is equal to Pi times the Diameter:

The Radius is equal to Diameter divided by 2:

Area is equal to Pi times the radius squared:

Pi is equal to 3.1415926!

Your Welcome!
Posted 2009-10-23T15:20:57Z
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Ian
316 answers
67 helpful answers

60/pi ~ 19. 0968... ~ 19.1 inches to nearest inch

"Shaded" means they overlap somehow, but we cannot see your diagram, or

get the idea from your words, of how the smaller ones are placed on the larger.

Please give more details.

If they are apart from eachother with their centres on the circumference of the larger, a very rough estimate would be pi X 8^2 minus 2 X (1/2) pi ~ 63 pi ~ 198 square units.

Regards - Ian
Posted 2009-10-25T23:00:50Z
Ian was invited by Yedda to answer this question.

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