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An inclined plane figure is foreshortened in the direction

  • A.equally in every direction
  • B.of the reference line only
  • C.of the inclination only
  • D.at right angles to the inclination only

Answer: C

Correct answer: of the inclination only

Tilting a figure about an axis shortens the dimensions measured across that axis, by the cosine of the tilt, while dimensions along the axis are unchanged. That is why an inclined circle becomes an ellipse rather than a smaller circle: one diameter keeps its length and the perpendicular one shrinks.

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