We get the idea that an "irregular sphere" is not a sphere. At that point, we know
exactly what it isn't, but not much yet about what it is. So you have to reveal a lot
more about it before anyone can calculate its volume. Like, for example, less info
about what the object is not like, and more definition of its actual shape.
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water displacement
First, calculate the radius. It is half the diameter. Then, to calculate the volume, use the formula: Volume = 4/3 x pi x radius3. Pi is approximately 3.1416.
volume of the cube - volume of the sphere = volume enclosed between the cube and sphere
To a first approximation, a tennis ball is a sphere. The volume of a sphere is V = 4/3 π r3, where r is the radius of the sphere. So measure the diameter of the tennis ball, divide by 2 to get the radius, and then apply the formula above. You could also measure the volume of a tennis ball by measuring the volume of water that it displaces.
The volume of a sphere with a radius of 4cm is about 268cm3