Question

An equilateral triangle is positioned in the first quadrant and is inclined at an angle of 30 degrees with the H.P and 30 degrees with the V.P. The top views while drawing projections in 1, 2 and 3 stages are _______  _________ and __________ respectively.

(a) line, equilateral triangle, line

(b) line, line, scalene triangle

(c) equilateral triangle, isosceles triangle, isosceles triangle

(d) equilateral triangle, isosceles triangle, scalene triangle

I have been asked this question in class test.

I'm obligated to ask this question of Projection of Oblique Plane in portion Projection of Planes of Engineering Drawing

Answer 1

Correct answer is (c) equilateral triangle, isosceles triangle, isosceles triangle

Easy explanation: As initially the plane is assumed to be parallel to H.P the top view will be an equilateral triangle and then the plane is tilted with respect to H.P to required angle the top view will be equilateral triangle compressed to isosceles triangle. Finally the plane is tilted with respect to V.P then isosceles triangle will just turn w.r.t V.P.