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May 19, 2013

Posted by shaquahia on Tuesday, January 6, 2009 at 5:44pm.

if I have the circumference of a circle how do I find the diameter, and how do I find the radius

• geometry - Writeacher, Tuesday, January 6, 2009 at 5:46pm

assistance needed

• 7th grade - Caroleen, Tuesday, January 6, 2009 at 5:50pm

The formula for finding diameter is:

Circumference = pi * d

Therefore, insert your circumference, and divide by pi or 3.14 to get the diameter.

Circumference = 2pi * r

So, insert your circumference and multiply pi by 2. Then divide the circumference by 2pi to get your radius.

Hope I helped! :-)

• 7th grade - lyne, Tuesday, January 6, 2009 at 5:51pm

Diameter = Circumference/pi

Circumference divided by Pi = Diameter

Diameter divided by 2 = radius

• 7th grade - shaquahia, Tuesday, January 6, 2009 at 6:06pm

circumference = 62.8 meters
using pi= 3.14

C = 62.8/ 3.14
= 20 meters

diameter =20 meters

d= 20 meters
r= 20/ 2
r=10 meters

thank you it was a great help

• 7th grade - rwf, Sunday, March 8, 2009 at 7:34pm

34yds find the circumference

• 7th grade - brian, Friday, September 11, 2009 at 8:10pm

34 yards for radius or the diameter?

cuz it could either be
(34x2) x 3.14= 213.52 yds
or
34 x 3.14= 106.76 yds

thats why you gotta state wether its diameter or radius

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