Divides a given line-segment externally in the ratio of 1:2

Construction:
i )Draw BX making an actueangle at B.
ii) Starting from B, mark 2 equal points on BX as shown in the figure.
iii) Mark the second division point as M
iv) Mark the first point (2-1=1) as N.
v) Join NA.
vi) Draw a line parallel to NA through M.
vii) This line meets the produced BA line at P.
viii) P is the required point which divides
AB externally in the ratio 1:2.