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Which two operations are the basis of constructive solid geometry?

  • A.trimming and extending of lines against chosen boundaries
  • B.hatching and dimensioning of completed views
  • C.layering and blocking of repeated geometry
  • D.extrusion and revolution of profiles, combined by Boolean operations

Answer: D

Sweeping a profile along a path or about an axis creates primitives, and union, difference and intersection combine them into the finished shape. It is the standard route from a two-dimensional sketch to a three-dimensional part.

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