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