Question

The figure shows the cross section of 0.2 m a concrete wall to be constructed. It is 0.2 m wide at the top, 2.0 m wide at the bottom and its height is 4.0 m, and its length is 40 m. Calculate the volume of the concrete in the wall

Answer 1

Area of the cross section of the wall
= 4.4 sq.m   ....from (a)
Volume of the wall
= Area of the cross section x length
= 4.4 x 40
= 176m³
∴ Volume of the wall is 176m³.