Discussion
For that same line the true inclination to the horizontal plane is about
Answer: C
Correct answer: 36.9 degrees
The true inclination is the angle whose tangent is the height difference over the plan length: \[ \tan\theta = \frac{45}{60} = 0.75, \qquad \theta = 36.9^\circ. \] Note that this is less than the apparent inclination measured in the elevation, as it must be - the projection always overstates the angle.
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