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Answer:
1. DIAGONAL
2.ADJACENT ANGLES
3.SUPPLEMENTARY
4.DIAGONALS/QUADRILATERAL
5.If both pairs of opposite angles of a quadrilateral are congruent, then the quadrilateral is a parallelogram.
6.If both pairs of opposite angles of a quadrilateral are congruent, then the quadrilateral is a parallelogram. If the diagonals of a quadrilateral bisect each other, then the quadrilateral is a parallelogram. If a quadrilateral is a rectangle, then it is a parallelogram.
7. The opposite angles of a parallelogram are equal. The consecutive angle of a parallelogram is supplementary. If one angle is a right angle, all the angles are right angles in a parallelogram. The diagonals of a parallelogram bisect each other.
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