It has 3 lines.......
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A triangle can have no parallel lines.
A regular triangle (aka equilateral triangle) has three lines of symmetry - these are its medians, In general, a regular n-gon has n lines of symmetry.
There can be only one pair of perpendicular lines in an isosceles triangle when it is a right angled isosceles triangle. A non right angled isosceles triangle has no pairs of perpendicular lines.
two if the triangle has a right angle
it depends upon the triangle that it have equal sides or not