Discussion
A rectangle 60 mm by 30 mm perpendicular to the horizontal plane and inclined at 40 degrees to the vertical plane appears in the plan as a line of length
Answer: C
Correct answer: 60 mm
Being perpendicular to the horizontal plane, the rectangle appears in the plan as a straight line, and the length of that line is the horizontal dimension of the rectangle, which is 60 mm. The inclination to the vertical plane sets the direction of the line but does not shorten it, since the plan shows horizontal lengths at true size.
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