jakyfraze
  • jakyfraze
Using the formula C = 2πr, find the circumference of a circle with diameter of 28 inches. A. 56 in. B. 28 in. C. 88 in. D. 44 in.
Mathematics
jamiebookeater
  • jamiebookeater
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jakyfraze
  • jakyfraze
@Nnesha can you please explain this to me
Nnesha
  • Nnesha
they already gave u the formula so just plugin the value remember radius is half of diameter r= d/2
anonymous
  • anonymous
28/2=14 C= 2 PI 14 = 87.96 C. 88

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anonymous
  • anonymous
c
Nnesha
  • Nnesha
\[r=\frac{ d }{ 2}\] d=diameter r= radius so replace d with 28 to find radius
jakyfraze
  • jakyfraze
@Nnesha so the answer is A?
anonymous
  • anonymous
The answer is C
Nnesha
  • Nnesha
how did you get 56 ?
Nnesha
  • Nnesha
d/2 = what ? replace d with 28
jakyfraze
  • jakyfraze
jakyfraze
  • jakyfraze
so decide 28/2? 14
Nnesha
  • Nnesha
yes right now 2 pi times 14
Nnesha
  • Nnesha
\[C = 2\pi r\] so substitute for 14 then solve
jakyfraze
  • jakyfraze
2 pi x 14?
Nnesha
  • Nnesha
yes right
jakyfraze
  • jakyfraze
oh okay. pi= 3.14 x 2 = 6.28. 6.28 x 14 = 87. 92. ANSWER 88 :D right?
Nnesha
  • Nnesha
yes right
jakyfraze
  • jakyfraze
yes!! thank you :)
jakyfraze
  • jakyfraze
jazakallah khair
Nnesha
  • Nnesha
:=)

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