2007-01-13 21:59:30 · 14 answers · asked by Anonymous in Science & Mathematics ➔ Geography
2 x 3.1479 x 4 You can do the rest
2007-01-13 22:07:51 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Pi is a special ratio of the number of times a diameter of a circle will go into the circumference and is use extensively in Mathematics and is equal to 22/7 or 3.142 to 3 decimal places. If you multiply the diameter by Pi this will give you the circumference. Therefore in your case 3.142 x 8 = 25.136 to 3 dec places. If you divide 22/7 out the decimal place goes on to infinity. 3 Decimal places is usually sufficient.
2007-01-13 22:13:10 · answer #2 · answered by ANF 7 · 0⤊ 0⤋
Diameter times Pi equals the circumference
Circumference = 8 x 3.142 cm
=24.8 cm to 1 decimal place
2007-01-14 01:32:15 · answer #3 · answered by rosie recipe 7 · 0⤊ 0⤋
The circumference is Pi (3.14159...) times the diameter of 2Pi times the radius.
2007-01-13 22:03:03 · answer #4 · answered by evan 2 · 0⤊ 0⤋
2pir is the formula you need. pi = 22/7 and r = length of the radius.
So, (2 x 22/7) x 4cm = 25.1429cm rounded up.
2007-01-15 22:56:41 · answer #5 · answered by Chariotmender 7 · 0⤊ 0⤋
formula for circle circumference is
P = 2 * pi * (radius)
so 2*3.14*4
= 25.12 cm
2007-01-13 22:05:12 · answer #6 · answered by a_m_del_in 2 · 0⤊ 0⤋
the circumference is the diameter multipled by Pi (3.1416)
So C = 8 Pi = 25.133 cm
2007-01-13 22:04:16 · answer #7 · answered by maussy 7 · 0⤊ 0⤋
C=2pi times radius.
2 times 3.14 times 4= 25.12cm.
I think. Haven't done trigonometry since school...20 years ago.
Don't quote me on that answer.
2007-01-13 22:14:40 · answer #8 · answered by Anonymous · 0⤊ 0⤋
C = ¶d where ¶ =3.14
C = 3.14 x 8 cm = 25.1cm
Should this not be a Maths. question rather than a Geography question!?
2007-01-13 22:07:24 · answer #9 · answered by Como 7 · 0⤊ 0⤋
If I tell you, you will never remember how to do it, do it yourself and learn at the same time. See link below www.mathgoodies.com/lessons/vol2/circumference.html
2007-01-14 05:08:56 · answer #10 · answered by P.A.M. 5 · 0⤊ 0⤋