Question

I need the answer urgent :-
Formula for total and curved surface area of hollow cylinder

Answer 1

The Lateral Surface Area (L), for a cylinder is:

L=C×h=2πrh, therefore,

L1=2πr1h, the external curved surface area.

L2=2πr2h, the internal curved surface area.

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Answer 2

The Total Surface Area will be:

2*π*(R^2-r^2)+2*π*R*h+2*π*r*h

=2*π(R+r)*(R-r)+2*π*(R+r)*h

=2*π*(R+r)*(R-r+h)

curved surface area are
2 π r (h + r)