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How to calculate the volume of a sphere?

According to the formula for the calculations of the volume of sphere, it requires only radius(r)

Let, Radius is 3

$$v\;=\;\frac{4}{3}πr^3$$

$$v\;=\;\frac{4}{3}(3.14)(3*3*3)$$

$$v\;=\;\frac{4}{3}(3.14)(27)$$

$$v\;=\;\frac{4}{3}(84.78)$$

$$v\;=\;\frac{339.12}{3}$$

$$v\;=\;113.04$$