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A line AB of length 85 mm is inclined 45 degrees to the horizontal plane and 60 degrees with the vertical plane.

A line AB of length 85 mm is inclined 45 degrees to the horizontal plane and 60 degrees with the vertical plane. Calculate the length of the projection in front view on vertical
plane.
a) 42.5 mm
b) 30 mm
c) 60 mm
d) 21.25 mm