A solid is composed of a cylinder with hemispherical ends. If the total height of the solid is 16.2 cm and the…

CBSE Class 10 Maths PYQ · Surface Areas & Volumes · Number of Units · 5 Marks · March 2025 · Basic

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1275 Marks · March 2025 · Basic
A solid is composed of a cylinder with hemispherical ends. If the total height of the solid is $16.2$ cm and the diameter of the cylinder is $4.2$ cm, find the volume and total surface area of solid. [$\pi = \frac{22}{7}$]
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$r = 2.1$ cm and $h = 16.2 - 4.2 = 12$ cm
Volume of the solid $= \pi r^2 h + \frac{4}{3} \pi r^3 = \frac{22}{7} \times \frac{21}{10} \times \frac{21}{10} \times 12 + \frac{4}{3} \times \frac{22}{7} \times \frac{21}{10} \times \frac{21}{10} \times \frac{21}{10} = 205.13$ cu.cm
Total surface area of the solid $= 2\pi rh + 4\pi r^2 = 2 \times \frac{22}{7} \times \frac{21}{10} \times 12 + 4 \times \frac{22}{7} \times \frac{21}{10} \times \frac{21}{10} = 213.84$ sq.cm
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