Posted by jamie on Wednesday, November 26, 2008 at 9:52pm.
How is the circumference of a circle with radius 9cm related to the circumference of a circle with diameter 9cm?
i don't understand this.Help?? Thanks:)

math  DanH, Wednesday, November 26, 2008 at 10:14pm
Start with the equation of circumference of a circle:
c = pi x d.
The diamter is 2 x radius. So, the diameter of the first cirlce is 18cm. You know the diameter of the second circle. So, how do the circumferences compare?

math  jamie, Wednesday, November 26, 2008 at 10:26pm
is the second circle twice as big? like is that how they compare?
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