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A hexagon is the simplest shape, and the only regular polygon, with 6 lines of symmetry.
An equilateral triangle has exactly three lines of symmetry. It is the only shape that contains exactly three lines of symmetry.
A rectangle. Obviously the right angles are in the four corners of the rectangle. The lines of symmetry occur across the horizontal and vertical. There are no lines of symmetry on the diagonal.
Only when the rectangle is a square.
The number 8 has only 2 lines of symmetry; Vertical and Horizontal.