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not a spelling mistake, this is perfectly grammatical (plural) |
Commented on use of variables and suggested precise language. |
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===Derivation===
{ ''Comment - This derivation is confusing because the symbols used in it do not correspond to those in the diagram on the right. Also, "perpendicular distance" is a number; it cannot be said to "lie" on the x-axis.'' ''The text could say, "both axes intersect the x-axis" or " the common perpendiculars to the the two axes are parallel to the x-axis."'' }
We may assume, without loss of generality, that in a [[Cartesian coordinate system]] the perpendicular distance between the axes lies along the ''x''-axis and that the center of mass lies at the origin. The moment of inertia relative to the ''z''-axis is
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