Question

to construct angle of 150 with compass

Answer 1

180-30=150

1) draw a line ZX longer than x cm
2) with a compass, draw a arc of radius x with X as center, let it cut ZX at X'
3) with X' as center and x radius draw an arc intersecting the arc at X".
4) with X' and X" as center draw intersecting arcs, say O
5) join O, X ∠ZXO=30°
6) extend ZX till Y where XY≈ x cm
7) ∠OXY=150°