Draw the projections of following points on a common reference line keeping the distance between their projectors 30 mm apart.
(i) Point A is 20 mm below the H.P. and 50 mm in front the V.P.
(ii) Point B is in the H.P. and 40 mm behind the V.P.
(iii) Point C is 30 mm in front of the V.P. and in the H.P.
(iv) Point D is 50 mm above the H.P. and 30 mm behind the V.P.