anonymous
  • anonymous
i'll medal please help
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
please help
anonymous
  • anonymous
can someone explain how to do it and not just give me the answer please

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anonymous
  • anonymous
@mathstudent55
anonymous
  • anonymous
circumference of a semicircle: (1/2) x pi x d where d is the diameter
anonymous
  • anonymous
so what is the diameter of the semicircle?
ybarrap
  • ybarrap
What is r here? That's that's the hardest part of the problem. |dw:1434406738797:dw|
ybarrap
  • ybarrap
What is the relationship between r and 3 ?
ybarrap
  • ybarrap
|dw:1434406911440:dw|
ybarrap
  • ybarrap
So the answer is \(\pi\times r\). So all you need to find is r. Any guesses?
anonymous
  • anonymous
oh sorry i was eating let me look
anonymous
  • anonymous
@ybarrap well 2 x pi is 6.28
anonymous
  • anonymous
i still dont know how to find r im sorry im bad at this
ybarrap
  • ybarrap
|dw:1434407560400:dw|
ybarrap
  • ybarrap
Do you see that what r is now?
anonymous
  • anonymous
ohhh
anonymous
  • anonymous
yes!
anonymous
  • anonymous
so is the answer 18.84?
ybarrap
  • ybarrap
What is r?
anonymous
  • anonymous
3 i think
anonymous
  • anonymous
or 1.5
ybarrap
  • ybarrap
Yes! So the answer is ....
anonymous
  • anonymous
9.42 ft
ybarrap
  • ybarrap
\(\pi\times r\), which is half the circumference of a circle with a radius of r
ybarrap
  • ybarrap
you know \(\pi\) and you know r - just multiply
anonymous
  • anonymous
ohhh it's 4.71?
ybarrap
  • ybarrap
Yes!
anonymous
  • anonymous
okay, thank you so much for your help! :-)

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