Question

FIND THE CIRCUMFERENCE FOR THE TWO. Leave your answer in terms of pi.

Answer 1

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

Answer 2

in the first one what is the diameter?

Answer 3

4.5

Answer 4

now use the formula @mathstudent55 gave you

c = π d just put in the diameter, leave the pi alone

Answer 5

what do you get?

Answer 6

what is the d?

Answer 7

d is diameter

Answer 8

you told me the diameter was 4.5

Answer 9

is it?

Answer 10

yes, it is, just substitute it in the equation c = πd

Answer 11

ok, this is what I mean... c = pi(4.5) done that is the answer

Answer 12

now in the 2nd one the give you radis, which is only half of a diameter, right?

Answer 13

so this time we need to use C = 2(r) pi what is the radis?

Answer 14

I'm not getting the correct answer for the first one

Answer 15

what are you getting?

Answer 16

how do you know it is not correct?

Answer 17

c = 4.5(pi) is the same as c = (pi)4.5

Answer 18

i got the wrong answr

Answer 19

you dont give good help...

Answer 20

@jim_thompson5910

Answer 21

it said 4.5pi was wrong?

Answer 22

anyways, for the second one, the radius is 20, so the diameter is 2*20 = 40

making the circumference to be d*pi = 40pi

Answer 23

I got 9.13 for the first one,,

Answer 24

it should be 4.5pi for the first one since 4.5 is the diameter

Answer 25

OH..Lol

Answer 26

yeah because it's

Circumference = pi * diameter