anonymous
  • anonymous
FIND THE CIRCUMFERENCE FOR THE TWO. Leave your answer in terms of pi.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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mathstudent55
  • mathstudent55
The circumference of a circle is given by the formula below: C = (pi)d = 2(pi)r d = diameter; r = radius For the first circle, you have its diameter, so use C = (pi)d For the second circle, you have its radius, so use C = 2(pi)r

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More answers

Jim766
  • Jim766
in the first one what is the diameter?
anonymous
  • anonymous
4.5
Jim766
  • Jim766
now use the formula @mathstudent55 gave you c = π d just put in the diameter, leave the pi alone
Jim766
  • Jim766
what do you get?
anonymous
  • anonymous
what is the d?
Jim766
  • Jim766
d is diameter
Jim766
  • Jim766
you told me the diameter was 4.5
anonymous
  • anonymous
is it?
Jim766
  • Jim766
yes, it is, just substitute it in the equation c = πd
Jim766
  • Jim766
ok, this is what I mean... c = pi(4.5) done that is the answer
Jim766
  • Jim766
now in the 2nd one the give you radis, which is only half of a diameter, right?
Jim766
  • Jim766
so this time we need to use C = 2(r) pi what is the radis?
anonymous
  • anonymous
I'm not getting the correct answer for the first one
Jim766
  • Jim766
what are you getting?
Jim766
  • Jim766
how do you know it is not correct?
mathstudent55
  • mathstudent55
c = 4.5(pi) is the same as c = (pi)4.5
anonymous
  • anonymous
i got the wrong answr
anonymous
  • anonymous
you dont give good help...
anonymous
  • anonymous
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
it said 4.5pi was wrong?
jim_thompson5910
  • jim_thompson5910
anyways, for the second one, the radius is 20, so the diameter is 2*20 = 40 making the circumference to be d*pi = 40pi
anonymous
  • anonymous
I got 9.13 for the first one,,
jim_thompson5910
  • jim_thompson5910
it should be 4.5pi for the first one since 4.5 is the diameter
anonymous
  • anonymous
OH..Lol
jim_thompson5910
  • jim_thompson5910
yeah because it's Circumference = pi * diameter

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