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

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 $0.80 \text{ m}$, height $0.40 \text{ m}$, so radius $r = 0.40 \text{ m}$).
• Part B: A rectangular section (width $1.20 \text{ m}$, height $0.60 \text{ m}$).
• Part C: A trapezoidal section at the top (bottom width $1.20