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Is quadrilateral ABCD a parallelogram? (1) BC and DA are parallel.

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Is quadrilateral ABCD a parallelogram? (1) BC and DA are parallel.  [#permalink]

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New post 02 Jun 2015, 11:39
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Is quadrilateral ABCD a parallelogram?

(1) BC and DA are parallel.

(2) BC and DA are equal in length.

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Re: Is quadrilateral ABCD a parallelogram? (1) BC and DA are parallel.  [#permalink]

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New post 05 Jun 2015, 03:19
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Parallelogram is defined as a quadrilateral with 2 pairs of parallel sides.

(1) BC and DA are parallel.
This can be both, parallelogram or not. See rectangle and trapezoid, both meet the requirements. Insufficient.

(2) BC and DA are equal in length.
Same as in Statement 1. Insufficient.

(1) & (2) Together.
If two sides are parallel and equal, two remaining sides will have the same properties. Sufficient.
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Re: Is quadrilateral ABCD a parallelogram? (1) BC and DA are parallel.  [#permalink]

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New post 05 Jun 2015, 03:36
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reto wrote:
Is quadrilateral ABCD a parallelogram?

(1) BC and DA are parallel.

(2) BC and DA are equal in length.


Questions: Is quadrilateral ABCD a parallelogram?

Statement 1: BC and DA are parallel.

With two opposite sides paralle the Quadrilateral could be a Parallelogram or a Trapezium

Hence, NOT SUFFICIENT

Statement 2: BC and DA are equal in length

With Two opposite Sides equal a Quadrilateral could be a Parallelogram or an Isosceles Trapezium with equal un-parallel legs

Hence, NOT SUFFICIENT

Combining the two statements:

With two opposite sides equal and Parallel, The quadrilateral is bound to be a Parallelogram

Hence, SUFFICIENT

Answer: Option
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Re: Is quadrilateral ABCD a parallelogram? (1) BC and DA are parallel.  [#permalink]

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Re: Is quadrilateral ABCD a parallelogram? (1) BC and DA are parallel. &nbs [#permalink] 03 Apr 2018, 17:20
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Is quadrilateral ABCD a parallelogram? (1) BC and DA are parallel.

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