anonymous
  • anonymous
Help with a couple of questions ASAP Medal+Fan+Recommendation
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Luigi0210
  • Luigi0210
Do you know what you are using for \(\pi \)?
anonymous
  • anonymous
22/7

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More answers

anonymous
  • anonymous
that's what me teacher told me to use
welshfella
  • welshfella
pi r^2 = 314 2/7 solve for r take pi to be 3.14
welshfella
  • welshfella
oh sorry i dddddidnt see the 22/7
anonymous
  • anonymous
it's ok
Luigi0210
  • Luigi0210
It's basically what @welshfella said, just plug it in like so: \(\Large 314 \frac{2}{7} = \frac{22}{7} r^2 \)
Luigi0210
  • Luigi0210
So multiple both sides by the reciprocal of 22/7, what do you get?
anonymous
  • anonymous
99.9090909091
Luigi0210
  • Luigi0210
Try leaving it in fraction form, it'll be a bit easier
anonymous
  • anonymous
100
welshfella
  • welshfella
write 314 2/7 as an improper fraction then multiply by 7/22 314 2/7 =[ (7*314) + 2] / 7 = 2200 / 7
Luigi0210
  • Luigi0210
Yup, and yup, now you just have \(\Large 100=r^2\) Now just find the square root.
anonymous
  • anonymous
10
anonymous
  • anonymous
@Luigi0210 10
Luigi0210
  • Luigi0210
Yup, nice job! Now you can just check it to be sure: \(\Large A=\frac{22}{7}r^2 \) \(\Large A= \frac{22}{7}(10)^2 \) \(\Large A = \frac{2200}{7} \) Which is indeed \(\Large 314 \frac{2}{7} \) :)
anonymous
  • anonymous
so 10 is the radius?
anonymous
  • anonymous
10 is radius @Luigi0210
Luigi0210
  • Luigi0210
Yup!
anonymous
  • anonymous
can you help with another quest
Luigi0210
  • Luigi0210
Sure, go ahead
anonymous
  • anonymous
anonymous
  • anonymous
^
Luigi0210
  • Luigi0210
I think breaking it up into two different shapes might help. I see a semi-circle and a square at the bottom, do you follow?
anonymous
  • anonymous
no clue bro never had done this in my life
anonymous
  • anonymous
i can skip this question it is extra credit
Luigi0210
  • Luigi0210
It's simple once you see what I mean, do you see the two shapes now? http://prntscr.com/9dcm55
anonymous
  • anonymous
yes
Luigi0210
  • Luigi0210
All you have to do is add the areas of the two shapes: \(\Large A=s^2 \) (for the square) \(\Large \frac{1}{2}A=3.14r^2 \) (for the semi-circle) Just plug in numbers and add them together: \(\Large A= 8^2 \) (square) \(\Large \frac {1}{2}A=3.14 (4)^2 \)
anonymous
  • anonymous
A=64 (square) 1/2 A=50.2
anonymous
  • anonymous
is the answer 114.2
anonymous
  • anonymous
@Luigi0210
welshfella
  • welshfella
yes looks good
anonymous
  • anonymous
ok thanks
welshfella
  • welshfella
welcome
anonymous
  • anonymous
can you help with this one?
anonymous
  • anonymous
@welshfella @Luigi0210
welshfella
  • welshfella
First find the radius by using the formula for the circumference:- C = 2 pi r then plug this value of r into the formula for the area Area = pi r^2

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