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Assertion: any line on an object may be scaled directly in an isometric drawing. Reason: isometric foreshortening is uniform in all directions.

  • A.both the assertion and the reason are true and the reason explains the assertion
  • B.both the assertion and the reason are true but the reason does not explain the assertion
  • C.the assertion is true but the reason given for it is false
  • D.both statements are false, only isometric lines being measurable

Answer: D

Foreshortening is uniform only along the three isometric directions, and a line oblique to all of them shortens by a different amount. Such a line must be located from the ends of isometric measurements rather than scaled.

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