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# Is quadrilateral Q a square? (1) The sides of Q have the

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Manager
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Is quadrilateral Q a square? (1) The sides of Q have the [#permalink]  28 Nov 2007, 15:19
(1) The sides of Q have the same length.
(2) The diagonals of Q have the same length
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С. only both can let us a square.
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yogachgolf wrote:
why 'a' is insuff?

you can imagine four sticks with same length that are pinned by hinges. you can easily transform the square to a different rhombuses and even to a line.
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Re: Square [#permalink]  28 Nov 2007, 16:24
yogachgolf wrote:
(1) The sides of Q have the same length.
(2) The diagonals of Q have the same length

C

Here il post u a drawing.
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DS Geometry.doc [232 KiB]

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Re: Square [#permalink]  28 Nov 2007, 17:41
GMATBLACKBELT wrote:
yogachgolf wrote:
(1) The sides of Q have the same length.
(2) The diagonals of Q have the same length

C

Here il post u a drawing.

Thanks guys.
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yogachgolf wrote:
walker wrote:
С. only both can let us a square.

why 'a' is insuff?

Because it can be a parellogram or rhombus..
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