Respuesta :

The formula for circumference is C=2[tex] \pi [/tex]r, where r is the radius. If given the diameter, divide by 2 to get the radius.
jinc0930
The formula of the circumference is πd(pi multiply by the diameter) or 2πr(pi multiply by 2 times the radius[which is the same as the diameter])


The formula for the area of a circle is
[tex]\pi r ^{2} [/tex]