Mean Section Method Homework: Cross Sectional Area Solution

[fonseh]

Homework Statement

I have problem of obtaining the cross sectional area .

Homework Equations

The Attempt at a Solution

Taking section 2-3 as an example , my working is [ (3.3 +4.8) / 2 ]* 5 = 20.25 , but the ans provided is 29.28 , how to get the 29.28 ?

 

[CWatters]

In section 2-3 the depths are

5 and 7.2

So the average depth is

(5+7.2)/2=6.1

The width is 4.8 so the area is 4.8*6.1=29.28