Question

Find the CSA of cylinder whose diameter is 42cm and height is 24cm
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Answer 1

Given -

• Diameter of cylinder(d) =42cm
• Height of cylinder(h) =24cm

To find -

• The CSA of cylinder

Solution -

$Diameter(d) = 42cm$

$Radius (r)= \frac{42}{2} cm \\ = 21cm$

We know that,

$CSA \: of \: cylinder = 2\pi \: rh$

Now putting the values of 'r' and 'h' we will get

$CSA \: of \: cylinder = 2 \times \frac{22}{7} \times 21 \times 24$

$CSA \: of \: cylinder = \frac{22176}{7}$

$CSA \: of \: cylinder = 3168$

$\therefore \: CSA \: of \: cylinder \: is \: 3168 {cm}^{2}$

Related Formulae -

• $Volume \: of \: cylinder = \pi {r}^{2} h$
• $CSA \: of \: cylinder = 2\pi \: rh$
• $TSA \: of \: cylinder = 2\pi \: r(r + h)$