112. Consider a right circular cone with given height h. The volume of the cone as a function of its radius r is given by V (r) = ²¹h.
Consider a right circular cone with fixed height h = 6 in.
a. Write the diameter d of the cone as a function of the radius r.
b. Write the radius r as a function of the diameter d.
c. Find (Vr) (d) and interpret its meaning. Assume that h = 6 in.