1. The problem statement, all variables and given/known data Use differentials to estimate the amount of paint needed to apply a coat of paint 0.05cm thick to a hemispherical dome with diameter 50m 2. Relevant equations A= 2(pi)r2 3. The attempt at a solution dr=0.0005 m r=25m dA=? (A=2(pi)r2)' dA= 4(pi)r*dr I wont go any further because the number is very small and i think incorrect. I am pretty sure I'm missing a step but I can't figure out what or why. Then again I could be way off.