Q. 354.0( 6 Votes )

A wooden ar

Answer :

Given:



• Cylinder with height(h) 10cm and diameter(2r) 7cm


• Hemispheres cut from the top and bottom


Total Surface Area = Curved Surface Area of Cylinder + Curved Surface Area of 2 hemi - spheres


= CSA of Cylinder + Total Surface Area of a Sphere


CSA of Cylinder = 2πrh where “r” is the radius of cylinder


“h” is the height of the cylinder


TSA of Sphere = 4πr2 where “r” is the radius of the sphere


So,


Total Surface Area of the Article = 2πrh + 4πr2


= 2π(3.5)(10) + 4π(3.5)2


= 119π sq. cm


OR


Given:



• Height of Cone(h) = 3.5m


• Radius of the base(r) = 12m


The volume of the cone


where “r” is the radius, “h” is the height of the cone



= 168π cu. metres


And, Curved Surface Area of the Cone = πrl


where “l” is the slant height of the cone


Now,


(using the Pythagoras theorem)



= 12.5m


CSA of Cone = π(12)(12.5)


= 150π sq. metres


So, 168π m3 is the volume of the rice and, 150π m2 of canvas cloth is required to cover the heap

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