Question

A rectangular lamina of sides 20 mm X 25mm has an edge in HP and adjoining edge in VP, is tilted such that the front view appears as a rectangle of 20 mm X 15 mm. The edge which is in VP is 30 mm from the right profile plane. Find its inclinations with the corresponding principal planes.

(a) 43.43^o

(b) 53.13^o

(c) 43.13^o

(d) 67.34^o

I have been asked this question by my school teacher while I was bunking the class.

The above asked question is from Projections of Planes topic in section Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing

Answer 1

The correct option is (b) 53.13^o

The best I can explain: Referring the figure below, on measuring the value of φ, inclination is known.