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Re: Is ABCD parallelogram [#permalink]
15 Aug 2009, 21:56
Is ABCD parallelogram ? a) Opposite sides i.e. (AB, CD) and (BC, AD) are equal. b) Opposite sides i.e. (AB, CD) and (BC, AD) are parallel.
D. (corrected, arghhh !!!) If opposite sides are parallel then it is for sure a parallelogram. We don't need to check for opposite angles or length of opposite sides specifically as this is implicit if opposite sides are parallel
Last edited by Economist on 15 Aug 2009, 22:53, edited 1 time in total.