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.

Polygon angles

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