1. The problem statement, all variables and given/known data A circular steel plate of radius 15 cm is cooled from 350 C to 20 C. By what percentage does the plates area decorate ? 2. Relevant equations A=∏r^2 Af = Ai (1+2∂ΔT) specific heat of steel = 12 x 10^-6 3. The attempt at a solution r = 15 cm = .15 m Ai = .070685 m^2 Af = Ai (1+2∂ΔT) = (.070685m^2)(1 + 2 (12 x 10^-6)(330 C)) = 23.3 m^2? What am I doing wrong? The final area does not look right at all. Thank you.