Question

?Find curved surface area and total surface of a cylinder when r = 7 and h = 12 cm

Answer 1

$\huge \mathsf{\orange {\underline {\purple {\underline { Required \ answer \ ♡ \ :- }}}}}$

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

$\huge\sf \pmb{\orange {\underline \pink{\underline{\:Ꭺ ꪀ \mathfrak ꕶ᭙ꫀя \: }}}}$

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)

$\sf{= 528 + 308 = 836cm².}$