Gestation or the length of pregnancy of a cat averages 64 days. It is generally between 62 and 67 days or about nine or ten weeks. When litters are large, length is often less. When litters are small, the length of the pregnancy may increase.
The sum of the interior angles of an octagon is 1080 degrees. In a regular octagon, divide by 8 for each angle = 135Â°. The formula for this is Sum = 180 (n-2) where n is the number of sides. (or 180n - 360) You can take the polygon and make [N] triangles, with points touching at the 'center'.
Each interior angles of a regular nonagon measures 140^o Sum of all interior angles of any convex N-sided polygon equals to (N-2)180^o The proof of this is simple. Pick an initial point O inside a polygon, connect it with all vertices, forming N triangles. Sum of all angles of these triangles is N*180^o. To get a sum of all interior angles we should subtract a sum of all angles lying around that initial point O, that is we have to subtract 360^o.