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A right angle on the object appears in isometric as

  • A.45 degrees in every isometric plane
  • B.30 degrees or 150 degrees
  • C.either 60 or 120 degrees
  • D.90 degrees in every isometric plane

Answer: C

Which of the two it becomes depends on the orientation of the corner within its isometric plane. It is the clearest demonstration that angular measurement on an isometric drawing is meaningless without reference to the underlying object.

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