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I2. The volume of spheres A sphere is a closed surface that is the locus of all points that are a fixed distance (the radius) from a fixed point (the centre). For a sphere of radius r, the volume is given by the formula: An example A sphere has a radius of 4cm. Find its volume. Find the volume, correct to the nearest whole number, of each sphere. Click on "Sphere radius" to get started. Volume= cm3