Discussion
A square of 40 mm side inclined at 60 degrees to the horizontal plane, hinged about one edge, has a plan of area about
Answer: B
Correct answer: 800 mm\( ^2 \)
Projected area is the true area times the cosine of the inclination: \[ 1600 \times \cos 60^\circ = 1600 \times 0.5 = 800\ \mathrm{mm^2}. \] Only the dimension across the hinge is shortened; the 40 mm along the hinge is unchanged, so the plan is a 40 by 20 rectangle.
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