ABCD is a quadrilateral and AC is a diagonal . prove that angle ABC congurent angle CDA . Is AB parallel CD?
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Step-by-step explanation:
given :abcd is a quadrilateral and ac is diagonal
to proof : abc is congruent to cda and ab is parallel to cda
proof
ac =ac (common side)
angle bac =angle dac ( alternate interior bangles are equal)
angle dac =angle dca ( alternate interior angles are equal)
therefore abc =cda
since abc =cda
ab is parallel to cd by cpct
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