Question

find TSA of a cylinder if its radius and height is 5cm and 21cm​

Answer 1

$\sf\huge\bold{Solution}$

Given

Radius of Cyclinder is 5 cm

Height of Cyclinder is 21 cm

To Find

Total surface area of cylinder

Total surface is the total area occupied by a solid figure from its base to the top surface.

Total surface Area of cylinder is 2πr(h+r)

$\sf \longmapsto2 \times \dfrac{22}{7} \times 5(21 + 5)$

$\sf \longmapsto \dfrac{44}{7} \times 5(26)$

$\sf \longmapsto \dfrac{44}{7} \times 130$

$\sf \bold{ = 817.14{cm}^{2} }$

Extra solved =>

Curved surface area of cylinder=2πrh

$\sf \longmapsto2 \times \dfrac{22}{7} \times 5 \times 21$

$\sf \longmapsto \dfrac{44}{7} \times 105 = 44 \times 15 = \bold{660 {cm}^{2} }$

Volume of cylinder =πr²h

=>22/7× 5²×21

=>22/7×25×21

=>22 ×25×3

=>1650cm³

Note : If you solve by taking pie value as 3.14 your answer may be differ as 1649.34cm³