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used to show a variation between two lines of value
They could be: parallel lines, perpendicular lines or intersecting lines
They are lines that cut through parallel lines
Any line divides the Cartesian plane into two parts. When deciding whether the line should be solid or dashed, think of the points on the line. If these points are not in the permitted region then it will be a dashed line, otherwise it will be a solid line. Usually this will mean that a strict inequality is dashed.
Angle is a space between two lines or surfaces that meet at one point, which you measure in degrees.