# From a solid cyli

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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