Question

find curved and total surface area of a cylinder when r=7cm,h=12cm​

Answer 1

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Curved surface area 

= 2πrh

= 2π×12×7

= 168π

= 168×722

= 24×22

= 528cm²

Total surface area

=CSA + 2πr²

=528 + 2π×7×7

=528 + (2×7×22)

$\sf{= 528 + 308 = 836cm².}$

Answer 2

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Curved surface area

= 2πrh

= 2π×12×7

= 168π

= 168×722

= 24×22

= 528cm²

Total surface area

=CSA + 2πr²

=528 + 2π×7×7

=528 + (2×7×22)

=528+308=836cm².