A rectangle has 2 lines of symmetry.

Quick Scoop: Key Idea

  • One line of symmetry is vertical, passing through the center and splitting the rectangle into left and right mirror halves.
  • The other line of symmetry is horizontal, passing through the center and splitting it into top and bottom mirror halves.
  • The diagonals of a rectangle are not lines of symmetry; if you fold along a diagonal, the sides and corners do not perfectly match up.

So whenever you’re asked “how many lines of symmetry does a rectangle have,” the correct answer is: exactly 2.

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