Thread: Trapezodial question

Hello, could somebody please help me with this..

I dont even know how to sketch this diagram, its so confusing. Could u please provide a diagram wif all the labels and working out. thanks so much^^ really need help asap, thanks, exam is tmrw

1) An excavation for a farm dam is 30m long and 25m wide at ground level. The sides slope down to a base that is 20m long and 10m wide. The bottom of the dam is 3m below ground level. Use the trapezodial rule with 5 sections to find an approximation for the volume.

Hello, Tom!

1) An excavation for a farm dam is 30m long and 25m wide at ground level.
The sides slope down to a base that is 20m long and 10m wide.
The bottom of the dam is 3m below ground level.
Use the trapezodial rule with 5 sections to find an approximation for the volume.

If I interpret the problem correctly, the hole looks this this:

Code:

                B *-------------------* C
                *                   *
              *                   *
            *         +         * 20
          *           :       *
        *             :     *
    A *-------------------* D
              30      :
                      : 3
                B'*---:-----------*C'
                *     :         *
              *       +       * 10
            *               *
        A'*---------------*D'
                 20

There is a horizontal 30 × 20 rectangle at the top.

There is a horizontal 20 × 10 rectangle at the bottom.

The perpendicular distance between the rectangles is 3 m.

Draw .


We have a frustum of a rectangular pyramid.

Can you finish it now?