Cross-sectional 18973

Calculate the cross-sectional area of the trapezoidal channel irrigation channel if its upper width is 7.9 m, its bottom width is 5.5 m, and its depth is 2.8 m.

Correct answer:

S =  18.76 m²

Step-by-step explanation:

$$\begin{gathered} a=7.9\text{m} \\ c=5.5\text{m} \\ h=2.8\text{m} \\ S=\frac{a+c}{2}\cdot h=\frac{7.9+5.5}{2}\cdot 2.8=\frac{469}{25}{\text{m}}^2=18.76{\text{m}}^2 \end{gathered}$$

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