Answer :

Given for conical heap,


Base Diameter = 9 cm


Base radius, r = 4.5 cm


[as radius = diameter/2]


Height, h = 3.5 cm


Slant height,





We know that,


Volume of cone


Where, r is base radius and h is the height of the cone.


Volume of rice = Volume of conical heap


Volume of rice



Also,


Canvas requires to just cover heap = Curved surface area of conical heap


And we know,


Curved surface area of a cone = πrl


Where r is base radius and l is slant height.


Canvas required = π(4.5)(5.7) = 80.61 cm2 [appx]


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