theorems for quadrilaterals
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Parallelogram Theorem #1 Converse: If each of the diagonals of a quadrilateral divide the quadrilateral into two congruent triangles, then the quadrilateral is a parallelogram. Parallelogram Theorem #2 Converse: If the opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram.
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Quadrilaterals
1.Angle sum property
The sum of the internal angles of a quadrilateral is 360° or 2π.
1.Angle sum property
The sum of the internal angles of a quadrilateral is 360° or 2π.
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