C= 24 pi ft.
I know the answers are r= 12 and d= 24
I just don't understand how to set it up to figure this out.
2007-09-16 08:22:21 · 6 answers · asked by Jen 4 in Science & Mathematics ➔ Mathematics
The circumference is pi*d and d = 2r.
2007-09-16 08:29:27 · answer #1 · answered by Tony 7 · 0⤊ 0⤋
The formula for the circumference, C, of a circle is C = 2Ï r, where r is the radius.
C = 24Ï ft.
C = 2Ï r, therefore:
24Ï = 2Ï r
Solve for r:
Divide both sides by 2 Ï:
24Ï / 2Ï = 2Ï r / 2Ï
The Ï's cancel out, so
24 / 2 = r, or
r = 24 / 2
r = 12 ft.
‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
d = 2r
d = 2 * 12
d = 24 ft.
‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
To check, substitute 12 for r and 24Ï for C in the equation C = 2Ï r.
(I'll let you do that)
2007-09-16 15:57:39 · answer #2 · answered by Wile E. 7 · 0⤊ 0⤋
The formula is C,(circumference) = Pi * Dia.
So the Dia is given to you as 24'.
The radius is half the diameter.
The whole problem was centered on
your knowing those two simple facts.
Do your reading.
2007-09-16 15:44:07 · answer #3 · answered by Irv S 7 · 0⤊ 1⤋
C= d * pi
so if its C=24pi ft
set 24pi equal to d*pi
24pi=d*pi
then divide pi on both sides and they cancel each other out
so 24=d
24 is the diameter. and the diameter is 2*r (r=radius)
so 24=2*r
divide and you get 12=r
2007-09-16 15:33:57 · answer #4 · answered by wondering!! 1 · 0⤊ 0⤋
Like I said, Tony's the name of a pizza man
Italianooooooooo sausageoooooo pepperroniooooooooooo guandaliooooooo!
2007-09-16 15:41:45 · answer #5 · answered by Tameeka 1 · 0⤊ 1⤋
C=2.pi.r
r=C/(2.pi)
C=pi. d
d=C/pi
2007-09-16 15:31:24 · answer #6 · answered by ecosierra51 2 · 0⤊ 0⤋