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Sphere Volume With Radius 3: Why Volume Equals Surface Area

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Formula: V = ⁴⁄₃ × π × r³
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The Radius 3 Geometric Coincidence

For radius = 3$, an intriguing numerical coincidence occurs where the numerical magnitude of volume equals the numerical magnitude of surface area:

Volume: V = ⁴⁄₃ × π × 3³ = ⁴⁄₃ × π × 27 = 36π ≈ 113.10 cm³
Surface Area: A = 4 × π × 3² = 4 × π × 9 = 36π ≈ 113.10 cm²

While the numbers match ($36\pi$), their physical units are fundamentally different: capacity in cubic units versus area in square units.

Common Questions About Sphere Volume With Radius 3: Why Volume Equals Surface Area

Because 4/3 × π × 3³ = 36π and 4 × π × 3² = 36π. Setting V = A gives (4/3)πr³ = 4πr², which simplifies to r = 3.

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