V = 169.65 m3
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56.54866776 or 56.55 cubic meters to 2 d.p.
150.796 m2 (rounded)
A cone is one third of the volume of the cylinder of the same base. Since a cylinder has a volume of pi x radius2 x height, the radius being 5.25m and the height being 3m, the volume of the corresponding cone would be 259.7704425m3.The surface area of the top of the cone is defined as pi x radius x slant height. The slant height, by pythagoras, is 6.046693311m, and so the area of the canvas required to cover the heap would be 99.73029825m2.
A rectangular prism with a length of 11m, width of 8m and height of 3m has a volume of 264m3
Radius: 3/2 = 1.5m