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ruled surface

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noun Geometry.
a surface that can be generated by a straight line, as a cylinder or cone.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Origin of ruled surface

First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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