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

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