## anonymous 5 years ago this one has lots of words.. but i dont get it ... AUTOMOBILE tires ate mounted on circular metal rims. if a tire rim has a 13- inch diameter, what is its circumference?

1. anonymous

my begging was to grab ur attention lmao and i suck... ;D

2. anonymous

circumference is given by $C = 2\pi r$ Since we have the diameter and not the radius, we first need to use the fact that the diameter is two times the radius. So if d = 13, then $r = \frac{13}{2}$ Now you just plug this r into the circumference formula.

3. anonymous

OK TY.