Question

The radius of the base of a cylindrical water
drum open at the top is 35 cm and height
1.3 m. Find the inner surface area of the
water drum.

Answer 1

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Given :-

• Radius of base = 35cm
• Height = 1.3m

=》 130cm

To find :-

inner surface area of the drum

Formula :-

( 2 × pi × r × h ) + pi × r^2

Solutions :-

Lateral surface area -

$= > 2 \times \frac{22}{7} \times 35 \times 130$

$= > 2 \times 22 \times 5 \times 130$

$= > 28600 {cm}^{2}$

Now lets find base area

$= > \frac{22}{7} \times 35 \times 35$

$= > 22 \times 5 \times 35$

$= > 3850cm ^{2}$

Lateral surface area + area of base = area of tank

=》 28600 + 3850

=》32450cm²

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