Geometry
Class 9-10

Volume of Sphere

V=43πr3V = \frac{4}{3}\pi r^3
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V = (4/3)πr³

Space enclosed by a sphere. Volume grows as cube of radius — double radius = 8× volume.

Real-World Applications

Ball sports — Football vs tennis ball volume comparison.

Medicine — Drug dosage in spherical pills.

Astronomy — Planet and star volumes.

Balloons — Air/helium volume for lift calculations.

Tanks — Spherical storage tank capacity.

Fruits — Watermelon, oranges volume estimation.

Bubbles — Soap bubble volumes.

Spherical bearings — Lubricant volume calculations.

Earth volume — 1.08×10¹² km³.

Cell biology — Spherical cell volumes.

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