If you know the gradient for a line (the m in y = mx + c) then tan-1 (m) will give you the angle between the line and the x axis.
So do tan-1 for both gradients and subtract to find angle between the lines.
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An angle is formed where two lines meet. Parallel lines do not meet. Therefore they do not form an angle. So there is no angle to have a name. So no name.
An angle is formed by the intersection of two straight lines. If the lines are perpendicular, they will form right angles.
A 90 degree angle is formed at a right angle.
If you mean an angle then an angle is formed by two straight lines meeting at a vertex.
It could be an obtuse, right, or acute angle depending on how the lines connect.