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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.
Leaders
A square by definition has lines of symmetry. Therefore a square cannot be drawn without any lines of symmetry.
3 lines of symmetry.
Infinitely many.