Question

A line which is parallel to vertical plane and making an angle of 50 degrees with horizontal has a length of 5 cm from side view. What is its true length?

(a) 6.52 cm

(b) 7.77 cm

(c) 3.2 cm

(d) 3.8 cm

This question was addressed to me during an interview for a job.

This interesting question is from True Length of a Straight Line and its Inclinations with the Reference Planes topic in chapter Projection of Lines of Engineering Drawing

Answer 1

Right option is (a) 6.52 cm

Explanation: True length of line parallel to vertical plane and making angle with horizontal plane can be of two values either from top view or side view but from front view the length will be given length. As here it is given side view L= 5/sin (50).