Draw quadrilateral ABCD. Draw the diagonal connected by B and D.
Label angle ABD as angle 1; angle DBC as angle 2; angle ADB as angle 3; angle BDC as angle 4.
What needs to be given in order to determine that angle 1 is congruent to angle 4? WHY?
What needs to be given in order to determine that angle 2 is congruent to angle 3? WHY?
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