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Question

If a solid cone of base radius r and height h is placed over a solid cylinder having same base radius and height as that of the cone, then the curved surface area of the solid so formed is __________.


Solution

Slant height of the cone, l = r2+h2

Curved surface area of the solid

= Curved surface area of cone + Curved surface area of cylinder

=πrl+2πrh=πrl+2h=πrr2+h2+2h

If a solid cone of base radius r and height h is placed over a solid cylinder having same base radius and height as that of the cone, then the curved surface area of the solid so formed is       πrr2+h2+2h         .

Mathematics
RD Sharma (2020, 2021)
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