What is the circumference, to the nearest tenth, of a circle with a diameter of 9ft?
a. 63.6ft
b. 28.3ft
c. 56.5ft
d. 14.1ft
I came up with 63.6ft or 28.3ft.
Not sure of formula.

Question

What is the circumference, to the nearest tenth, of a circle with a diameter of 9ft? 
a. 63.6ft
b. 28.3ft
c. 56.5ft
d. 14.1ft
I came up with 63.6ft or 28.3ft.
Not sure of formula.

anonymous · Answer

Diameter is twice the radius. What's the equation for circumference if you know the radius?

anonymous · Answer

the formula is 2*pi*r so you would take half the diameter and multiply it by 2*pi

anonymous · Answer

That makes it much more clear..thanx! I was trying to make it harder than it was!

anonymous · Answer

I do that all the time :p Welcome!