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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 sol…

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 sol…
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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
C. 450πcm²
D. 360πсm²​

asked
User Ericjbasti
by
7.9k points

1 Answer

7 votes

Answer:

CSA of cylinder= 2πr(h+r)

=2 π×9 (21)

= 378π cm²

now

CSA of hole= 2πr

12π cm²

answered
User Viktor Joras
by
9.0k points
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