Question

Surface Area
Cylinder
Find CSA TSA and volume
radius =21cm
height=7cm​

Answer 1

Answer:

If  radius =21cm , height=7cm​ then CSA= 924 sq. cm, TSA = 3696 sq. cm and volume is 9702 cubic cm.

Step-by-step explanation:

Given

Radius = 21cm

Height = 7cm​

The curved/lateral surface area of cylinder

$2\pi rh= 2 \times \frac{22}{7} \times 21 \times 7\\= 2 \times 22 \times 21\\= 924 sq. cm$

The total surface area of the cylinder

$= 2 \pi r(h + r)\\= 2 \times \frac{22}{7} \times 21 (7 + 21)\\= 2 \times 22 \times 3 (28)\\= 3696 sq. cn$

Volume of cylinder

$= \pi r^2h\\=\frac{22}{7} \times (21)^2 \times 7\\= 22 \times 441\\=9702cm^3$