Answer :

Here we have to find the surface area of a solid cylinder whose radius and height is given.


Surface area of a solid cylinder having radius ‘r’ and height ‘h’


S.A = Curved surface area + Area of base and upper portion


In a solid cylinder Base & upper portions are in the form of a circle of radius ‘r’



S.A = 2πrh + 2πr2 . -------------------- (1)


Where r = radius of the upper and lower portions


h = height of the cylinder.


Here values of ‘r’ and ‘h’ are given.


Note: Here we have to convert the values of ‘r & ‘h’ from cm to mm.


r = 2 cm = 20 mm


h = 10 cm = 100 mm


Substituting the values of ‘r’ and ‘h’ in equation (1).


S.A = 2πrh + 2πr2


= 2πr(r +h) π


= 2 × (22/7) × 20(20+100) mm2.


= 1.5 × 104 mm2


The surface area of the solid cylinder = 1.5 × 104 mm2


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