Re: A 143
Having already stood up does not provoke attacks of opportunity. It's only beginning to try to stand up that makes you let your guard down.
A 144You follow the above rule for diagonal measurement, with just one exception:Diagonals
When measuring distance, the first diagonal counts as 1 square, the second counts as 2 squares, the third counts as 1, the fourth as 2, and so on.Since your question is about Large and Huge creatures, you simply follow the basic diagonal measurement rule.Note: Small and Medium creatures wielding reach weapons threaten all squares 10 feet (2 squares) away, even diagonally. (This is an exception to the rule that 2 squares of diagonal distance is measured as 15 feet.)