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Quadrilaterals (Theorums for polygons (Theorums for Parallelograms (If a…

- - - - Diagonals of Parallelograms
        
        If a quadrilateral is a parallelogram, then its diagonals bisect each other
        
        If a quadrilateral is a parallelogram, then each diagonal separates the parallelogram into two congruent triangles
  - - - The midsegment of a trapezoid is parallel to each base and its measure is one half the sum of the lengths of the bases