h = 4m
slant height = 7m
volume of the cone:
[tex]V\text{ = }\frac{1}{3}\pi r^2h\text{ }[/tex]But first we need to find the radius, as follows:
now the volume of the cone is:
[tex]V\text{ = }\frac{1}{3}\pi(5.74)^2(4)=138.23m^3[/tex]if the sand weighs 50kg per m³, then
50 x 138.23 = 6911.5 kg is the weight of the sand
