Give all angles of rotational symmetry less than 360°, listed from least to greatest. The angles of rotational symmetry less than 360°, listed from least to greatest, are

any line whose slope not equal to -4 does not satisfy these requirements.

step-by-step explanation:

going from (1,2) to (3, -6), x increases by 2 and y decreases by 8.   thus, the slope of a line thru those two points has the slope m = -8/2, or   m = -4.

thus, no line that has a slope different from m = -4 could be appropriate.