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 cm^{2} [appx]

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