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anonymous
 one year ago
MEDAL AND FAN
1 All circles are similar to each other.
True
False
2 Find the exact area of a circle having the given circumference.
8
A =
4√2
16
64
3 Find the exact area of a circle having the given circumference.
3
A =
2.25
3
9
4 Find the exact circumference of a circle with an area equal to 36 sq. in.
12
18
324
anonymous
 one year ago
MEDAL AND FAN 1 All circles are similar to each other. True False 2 Find the exact area of a circle having the given circumference. 8 A = 4√2 16 64 3 Find the exact area of a circle having the given circumference. 3 A = 2.25 3 9 4 Find the exact circumference of a circle with an area equal to 36 sq. in. 12 18 324

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mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.12. Use the circumference formula to find the radius. Then use the area formula to find the area.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.13. Solve it same way as 2.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.14. Use the area formula to find the radius. Then use the circumference formula to find the circumference.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1If you have questions, just ask.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0cant remember the area formula for a circle

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0can you work out number 2 for me?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Here are the formulas you need. \( \Large C_{circle} = 2 \pi r\) \(\Large A_{circle} = \pi r^2\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1438148434752:dw

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.12 Find the exact area of a circle having the given circumference. 8 A = 4√2 16 64 If the circumference is 8, we set 8 equal to teh circumference formula and find the radius. \(\large C_{circle} = 2 \pi r\) \(\large 8 = 2 \pi r\) \(\large \dfrac{8}{2 \pi} = \dfrac{2 \pi r}{2 \pi} \) \(\large \dfrac{4}{\pi} = r\)

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1You stared it out correct. You need to divide both sides by pi. dw:1438148608264:dw

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Ok with the radius?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0do i need to divide 4 by pi or is that the final radius?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1No. Don't divide. The problem wants an exact area, so we can't divide by pi and give an approximate decimal. We need to keep pi in the radius. Now we find the area.

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1\(\large A = \pi r^2\) \(\large A = \pi \times \left( \dfrac{4}{\pi} \right) ^2\) Ok so far with the area?

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1dw:1438148873842:dw

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1dw:1438148931770:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so the answer is \[16\]

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1No. Not 16*pi It's 16/pi

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.1Wait. There is no pi at all in problem 2 or in the choices. Was the circumference 8 or 8pi?
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