Question

A tetrahedron is made to place on V.P that is with its axis perpendicular to it and one of the edges of base parallel to H.P and then the tetrahedron is made to rotate w.r.t to V.P up to an acute angle. The top view of previous and later one is __________

(a) isosceles triangle, isosceles triangle

(b) equilateral triangle, isosceles triangle

(c) equilateral triangle, square

(d) square, irregular polygon of 4 sides

The question was posed to me by my school teacher while I was bunking the class.

I would like to ask this question from Projections of Solids with Axis Inclined to Vertical Plane and Parallel to Horizontal Plane in chapter Projection of Solids of Engineering Drawing

Answer 1

Right option is (a) isosceles triangle, isosceles triangle

To explain I would say: As normal a tetrahedron gives equilateral triangle for a project to its base and isosceles triangle for other view when placed without inclination but here inclination is given but given view is top view so the shape will not change but rotate to given angle.