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It depends what you mean by a plane inch. If you mean an inch length on a plane surface, the conversion is 1 to 1 so that 24.6 inch is 24.6 plane inches.

If, instead, you mean the measure of an area in a plane, the answer is that there is no equivalence. An inch is a measure of length or distance while according to the above definition, a plane inch is a measure of area. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.

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12y ago

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