Here is the question:
I have posted a link there to this topic so the OP can see my work.Integration using trapezium rule?
The diagram shows the cross section of a water-trough. One side is vertical and the other side slopes. Calculate the depth of water in the trough when it is exactly half-full. (Hint: this means the areas of two trapezia must be equal.)
Above link is shows the diagram of this question.
The answer to this question= 27.19cm
Please explain to me how to get this answer.