Q. 305.0( 2 Votes )

From a solid cyli

Answer :

Height of solid cylinder, h = 2.8 cm

Diameter of solid cylinder = 4.2 cm


So, radius of solid cylinder, r = 4.2/2 = 2.1 cm


We know that the relation between slant height, radius and height is


l =


l =


l = √12.25


l = 3.5 cm


Here Total surface area of remaining solid = Curved surface area of cylinder + Area of base + Curved surface area of cone


We know that C.S.A of cylinder = 2πrh,


Area of base = πr2


And C.S.A of cone = πrl


T.S.A of remaining solid = 2πrh + πr2 + πrl


= πr (2h + r + l)


Substituting the values,


= π (2.1) (2(2.8) + 2.1 + 3.5)


= (22/7) (23.52)


T.S.A. = 73.92 cm2


Ans. The total surface area of remaining solid is 73.92 cm2.


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