Not all are this shape, but one reason may be that they are quick and easy to machine in factories.
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Because that is the shape that is defined by the term "cylinder" and describedas "cylindrical". If it were any other shape, then it would not be a cylinder.
That shape is called a cylinder.That shape is called a cylinder.That shape is called a cylinder.That shape is called a cylinder.
Is a cylinder!
a circle is a 2D shape while a cylinder is 3D shape
A compound shape comprising a cylinder and a cone. There is no single name for such a shape.