square - regular 2d shape with 4 sides and 4 lines of symmetry, quadrilateral - 2d shape, 4 sides, circle - one sided, 2d shape, infinite lines of symmetry, triangle - 3 sided 2d shape, rectangle - 2 pairs of equal sides, 2 lines of symmetry, pentagon - 5 corners, 5 sides, octagon - 8 sides, 8 corners, 8 lines of symmetry, symmetry - a line to divide the shape so it's exactly the same on both sides, nonagon - 9 sides, 9 corners, decagon - 10 sides, 10 corners, dodecagon - 12 sides 12 corners,

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