lines of symmetry of a parallelogram - 0, lines of symmetry in a kite - 1, lines of symmetry of a square - 4, exterior angle of a pentagon - 72, interior angle of a hexagon - 120, exterior angle of a nonagon - 40, interior angle of a decagon - 144, angle sum of a pentagon - 540, angle sum of a quadrilateral - 360, angle sum of a hexagon - 720, order of rotational symmetry of a nonagon - 9, exterior angle of a shape with 20 sides - 18,

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