How can you find a diameter by knowing the circumference of a circle.
e.gThe circumference of a circle is 22cm ,then how could we find out the diameter or the radius?
Can you help me with this please?
2006-10-23 12:20:02 · 7 answers · asked by Dharshi 2 in Science & Mathematics ➔ Mathematics
ok, well circumfrence is C= 2TTr.
so if C=22cm,
22 cm= 2TTr
divide by 2 so you can get r alone
22=2TTr
-----------
2
so,
11= TTr.
TT always equals about 3.14.
so,
11=3.14r
divide by 3.14
11=3.14r
-------------
3.14
3.5=r
so your radius is 3.5 cm!
diameter is 2r.
so 2(3.5) = d
d= 7cm!
2006-10-23 12:31:28 · answer #1 · answered by Me 2 · 0⤊ 0⤋
Hi. ALL circles, every one every where, have a relationship of the diameter to pi. Pi times the diameter equals the circumference. The circumference divided by pi equals the diameter. ALWAYS, ALWAYS, ALWAYS.
2006-10-23 19:25:25 · answer #2 · answered by Cirric 7 · 0⤊ 0⤋
Circumference = 2pir
22=2xpixr
r = 11/pi
2006-10-23 19:23:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋
well.
let the diameter be known as D
since circumference = pie x D
hence 22 = pie x D
and so D = 22 / pie
2006-10-23 19:24:00 · answer #4 · answered by luv_phy 3 · 0⤊ 0⤋
Divide by pi, there is a pi symbol on a calc, it looks like a table with a wavy top. pi is 3.141592... it goes on for ever, and the pattern never repeats. It has been taken to a million places to see.
So: 22/pi=22/3.1415...=7.003 ...is "and so on"
2006-10-23 19:25:32 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Measure the outer side of the circle.
2006-10-23 19:23:23 · answer #6 · answered by Good Grief 4 · 0⤊ 0⤋
d=C/pi=22/22/7=7 cm
2006-10-23 19:34:13 · answer #7 · answered by raj 7 · 0⤊ 0⤋