Question

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​

Answer 1

Answer is

d) 21.25 mm

I can't able to give u solution sorry