Final answer:
To accurately draw the planes and directions in a cubic unit cell, we need to know the lengths of the axes and the angles between them.
Step-by-step explanation:
A cubic unit cell is defined by the lengths of three axes (a, b, and c) and the angles (a, ß, and y) between them.
In order to draw the plane (1 -1 3) in the cubic unit cell, we need to first determine the length of the axes and the angles.
Without this information, it is not possible to accurately draw the planes and directions in the unit cell. It is important to have the dimensions of the unit cell to visualize the planes and directions correctly.