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A triangle has six elements – 3 sides and 3 angles. To construct a unique triangle, 3 elements out of six elements are required under a certain combination. A quadrilateral has 8 elements – 4 sides and 4 angles. In addition to these elements a quadrilateral has 2 diagonals which play an important role in determining the size and shape of a quadrilateral. Thus a quadrilateral has 10 elements (4 sides, 4 angles and 2 diagonals) or measurements.
https://www.careerlauncher.com/cbse-ncert/class-8/Math/CBSE-PracticalGeometry-Notes.htmlThis a quadrilateral has 10 elements (4 sides, 4 angles and 2 diagonals) or measurements.