Question

Find the curved surface area of a cylinder with following dimensions
Radius of the base = 7cm
and height = 21cm​

Answer 1

Radius of cylinder (r)=7cm

Height of cylinder (h)=15cm

Curved Surface Area =2πrh

=2×(22/7)×7×15

=660cm

2

Total Surface Area =2πr(h+r)

=2×(22/7)×7(15+7)

=2×22×22

=968cm

2

Answer 2

Step-by-step explanation:

$\begin{gathered}\\ : \implies \displaystyle \sf \: C.S.A _{(cylinder)} = 2\pi rh \\ \\ : \implies \displaystyle \sf \: C.S.A _{(cylinder)} =2 \times \frac{22}{7} \times 21 \times 100 \\ \\</p><p>: \implies \displaystyle \sf \: C.S.A _{(cylinder)} =44 \times 300\\ \\: \implies \displaystyle \sf \: C.S.A _{(cylinder)} =44 \times 300 \\ \\ \\\end{gathered}$