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The diagram below shows the cross-section of a structure used as part of building construction design. All dimensions are given in metres and the structure is 6 metres long.
(a) Calculate
(i) The cross-sectional area of the structure.
(ii) The volume of the material used to fill the structure.
(b) The material used to fill the structure is concrete made by mixing gravel, sand and cement in the ratio 6:5:2 by mass. Given
that the density of concrete is 1.3g/#cm^3#, calculate the mass in tonnes of each component in the concrete.