Figure 2 shows a cross-sectional view of a structure 3m long. The structure consists of three parts: Part A: A semi-circular drain hole at the bottom (width 0.80 m, height 0.40 m, so radius r = 0.40 m

You're on a roll — Let's solve the problems from Section B: Professional Calculation. QUESTION 6: Figure 2 shows a cross-sectional view of a structure 3m long. The structure consists of three parts: Part A: A semi-circular drain hole at the bottom (width 0.80 m, height 0.40 m, so radius r = 0.40 m). Part B: A rectangular section (width 1.20 m, height 0.60 m). Part C: A trapezoidal section at the top (bottom width $1.20