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A square is a type of parallelogram which is a type of quadrilateral which is a polygon.

from Wikipedia

A convex quadrilateral is a square if and only if it is any one of the following:[2][3]

  • a rectangle with two adjacent equal sides
  • a quadrilateral with four equal sides and four right angles
  • a parallelogram with one right angle and two adjacent equal sides
  • a rhombus with a right angle
  • a rhombus with all angles equal
  • a quadrilateral where the diagonals are equal and the perpendicular bisectors of each other, i.e. a rhombus with equal diagonals
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13y ago

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