use this
tan(angle) = y / x
A
tan(angle)A = 4.80/-1.00 = -4.80
angle A = - 78.2 in 2nd quadrant or 101.8°
tan(angle) B = -3.40 / 3.00 = -48.6 ° in 4th quadrant
so
101.8 + 48.6 = -150.4° or about 150° = angle between A and B
B
(angle) A = arctan(5.00 / 4.00) = 51.3° in 1st quadrant
(angle) B = arctan(5.60 / 12.0) = 25.0° in 1st quadrant
so
51.3 - 25.0 = 26.3° between them
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