i'll medal please help

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i'll medal please help

Mathematics
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please help
can someone explain how to do it and not just give me the answer please

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Other answers:

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

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