a’

b’

c’

a.b c

50

70 a.b

c

a1’

b1’

c1’

a1’

b1’

c1’

a1 b1

c1

45º

Problem 9 : A plate having shape of an isosceles triangle has base 50 mm long and

altitude 70 mm. It is so placed that in the front view it is seen as an equilateral triangle of

50 mm sides and one side inclined at 45º to xy. Draw its top view

An isosceles triangle can be

seen as a equilateral triangle in

the F.V. only when its surface is

inclined to VP. So for the first

view keep the plane // to VP,

with 50 mm long edge

perpendicular to the HP.

Step 2:F.V. (equilateral

triangle) is drawn first

Step 3: Incline a1’b1’ at 45º to

the H.P.