# Integral octagon

**Discrete Mathematics**Level 5

We will say that an octagon is *integral* if it is equiangular, its vertices are lattice points (i.e., points with integer coordinates), and its area is an integer.

For example, the figure on the above shows an integral octagon of area 19.

Determine the smallest positive integer \(K\) so that there is exist an integral octagon, none of whose sides are parallel to the coordinate axes, has area of \(K\).