reciprocal lattice

[Howlin]

1. The problem statement, all variables and given/known data
a 2d oblique lattice is described by the following vectors:
a = 3i
b = 0.5i + j
sketch the unit cell of this lattice

Sketch accurately the reciprocal lattice of the cell and justify the direction and relative magnitudes of each reciprocal lattice vector



3. The attempt at a solution

Isnt the unit cell and reciprocal lattice be the same?
for the unit cell you plot the points and then plot a point out from 3i up 1j and over 0.5i

Is this right?