The blue paint bottle covers an area of $600 c m^{2}$ . Will one bottle be sufficient to paint the entire cylindrical block given below? [Use 𝜋 = 3.14]

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Solution

The diameter is 10 cm.
So the radius = $\frac{10}{2} = 5 c m$
We have to find the surface area of the cylinder.
The surface area of cylinder = $2 π r (r + h)$
$= 2 \times$ 3.14 $\times$ $5 (5 + 14)$
$= 596.6 c m^{2}$
The calculated area is $596.6 c m^{2}$ .
The bottle can cover $600 c m^{2}$ , so blue paint will be sufficient for the cylinder.

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