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Question

In the given figure, if AD = BC and AB || CD then which of the following is true?


A
AB = DC
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B
None.
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C
AB = AD
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D
BC = CD
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Solution

The correct option is A AB = DC
In △ABC and △ADC
AD = BC (given)
AC = CA (common)
and ∠DAC = ∠BCA (alternate angles between two parallel lines)

Therefore, we can say that △DAC is congruent to △BCA.

Hence, by CPCT, we can say that AB = DC.

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