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The rotation method finds the true length of a line by

  • A.rotating it parallel to a principal plane
  • B.rotating the principal planes about the line
  • C.projecting it onto an inclined auxiliary plane
  • D.constructing a triangle on the reference line

Answer: A

Correct answer: rotating it parallel to a principal plane

The rotation method swings one end of the line about the other until the line lies parallel to a plane of projection, keeping its length unchanged throughout. In its new position it projects at true length onto that plane, and the angle it then makes with the reference line is its true inclination.

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