Question

A line parallel to vertical plane is held at 35 degrees with horizontal plane and side view gives 3 cm of length. What is the true length of line?

(a) 5.2 cm

(b) 3.66 cm

(c) 2.45 cm

(d) 1.72 cm

The question was asked in an interview for internship.

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

Answer 1

The correct answer is (a) 5.2 cm

For explanation: True length of line parallel to vertical plane and making angle with horizontal 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= 3/sin (35).