the BASIC law of a angle is that a angle must be made by two line ,one line can't make any angle ,a straight angle is make by 2 line not 1 ; you it is only one it is because both line are in the same...
It meets all definitions I can find, and it would seem that a straight angle can be adjacent. Definition: (1) Two angles that share a common side and a common vertex, but do not overlap. (2) An...