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Mathematics 21 Online
OpenStudy (anonymous):

The figure below shows rectangle ABCD. The two-column proof with missing statement proves that the diagonals of the rectangle bisect each other. Statement Reason ABCD is a rectangle. Given and are parallel Definition of a Parallelogram and are parallel Definition of a Parallelogram Alternate interior angles theorem Definition of a Parallelogram ∡ADB ≅ ∡CBD Alternate interior angles theorem Angle-Side-Angle (ASA) Postulate CPCTC CPCTC bisects Definition of a bisector Which statement can be used to fill in the blank space? ∡ABD ≅ ∡DBC ∡CAD ≅ ∡ACB

OpenStudy (anonymous):

|dw:1376398172771:dw| ANG ABD does NOT equal ANG DBC, so I assume the second option should be the right one. Have to admit that your question seems a bit 'out of sync', btw.

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