Question

A line of length 5 dm is parallel to vertical plane and inclined to horizontal plane with an angle of 55 degrees. What is the length in top view?

(a) 2.86 dm

(b) 4.09 dm

(c) 5 dm

(d) 2.5 dm

I had been asked this question in a job interview.

My question comes from Projection of Line Inclined to one Plane and Parallel to other topic in chapter Projection of Lines of Engineering Drawing

Answer 1

Right answer is (a) 2.86 dm

The best explanation: Here accordingly the conditions given that line is parallel to vertical plane and inclined to horizontal plane at 55 degrees the top view’s length is the cosine of actual length. 5 dm x cos (55) = 2.86 dm.