what is the answer to this 2pi*5.05^2+2pi*5.05*13.8
2pi*5.05^2+2pi*5.05*13.8 factor out 2 * pi * 5.05
2*pi*5.05 [ 5.05 + 13.8 ]
10.10 * pi [ 18.85 ]
10.10 * 18.85 * pi ≈ 598.112
