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parallelogram

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albinogmat Just gettin' started! Default Avatar
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parallelogram Post Mon Nov 21, 2011 5:00 am
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  • Lap #[LAPCOUNT] ([LAPTIME])
    ABCD is a quadrilateral. Is ABCD a parallelogram?
    (1)AD=BC
    (2) ABD and ACD are equal

    I went for E but the OA says C. Please explain.

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    Post Mon Nov 21, 2011 5:16 am
    ABCD is a quadrilateral. Is ABCD a parallelogram?
    Quote:
    (1)AD=BC
    ABCD can be a parallelogram or an isosceles trapezoid.

    Quote:
    (2)Triangles ABD and ACD are equal? Assuming : that the areas of the triangles are equal
    Then ABCD can be a Paralleogram(rectangle, square, rhombus) or an isosceles trapezoid.

    IMO E
    What is the source of the question ?

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