Question 1103910
The ends of the can will not be covered.
{{{A[E]=2pi*R^2}}}
The label will cover,
{{{A[L]=2pi*R*H}}}
The total surface area is then,
{{{A[T]=A[E]+A[L]}}}
{{{A[T]=2pi*R^2+2pi*RH}}}
{{{A[T]=2pi(R^2+RH)}}}
The fraction is then,
{{{F=A[L]/A[T]}}}
{{{F=(2pi*RH)/(2pi(R^2+RH))}}}
{{{highlight_green(F=(RH)/(R^2+RH))}}}