Need Physics Help.. Heat Expansion?

Question

Imagine an aluminum bar encircling the earth. If the bar temperature increases by 1 degree fahrenheit, how high off the ground would the bar be if the entire bar is at that height? Assume a perfectly spherical earth.

Answer 1

R+2h=(R+h)alphaxrise in temperature
where R is radius of earth ,alpha is temperature co eff.of aluminum

Answer 2

Don't have enough information to process that answer>