A hole of radius 6cm is drilled through a right circular cylinder whose base radius and height are 9cm and 12cm respectively. What is the total surface area of the resulting solid? A. 117πcm ² B. 315 πcm²

asked Jul 15, 2023 134k views

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7 votes

Answer:

CSA of cylinder= 2πr(h+r)

=2 π×9 (21)

= 378π cm²

now

CSA of hole= 2πr

12π cm²

Viktor Joras answered Jul 20, 2023

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