If you have a Lease, you should look to when the month-to-month obligations are effective. If it states that you pay on a calendar month basis, then your notice will be considered as being more that the required 30 days, and that you owe for the full following month.
A regular polygon is equiangular, which means all angles are the same measure. In the case of a regular hexagon, the sum of 720 degrees would be distributed evenly among the six sides. So, 720/6 = 120. There are six angles in a regular hexagon, each measuring 120 degrees.
In a hexagon, the radius, or distance from the intersection of two sides to the center of the hexagon, is equal to the side length, and the diameter equals twice the radius. For example, if each side in your hexagon equals 13 inches, your diameter would be 26 inches.