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property of square

by ayushiiitm » Sun May 23, 2010 12:04 am
Is quadrilateral Q a square?
(1) The sides of Q have the same length.
(2) The diagonals of Q have the same length.

I think that answer should be A
But it is given as c
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by liferocks » Sun May 23, 2010 12:10 am
From 1
Quadrilateral can be rhombus or square..not sufficient

From 2
the quadrilateral can be rectangle or square...not sufficient

combining
quadrilateral can only be square...sufficient

Ans option C
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by ausgmat2008 » Sun May 23, 2010 5:07 am
Great thanks for the reply.

Also for those who want to know area of a rhombus is 1/2(diag1+diag2) - whcih can also mean the diagonals are of different lengths.

Special case obviosuly being a square with both diagonals of the same lenght as well as the all sides of same length.
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by sumanr84 » Sun May 23, 2010 9:32 am
ausgmat2008 wrote:Great thanks for the reply.

Also for those who want to know area of a rhombus is 1/2(diag1+diag2) - whcih can also mean the diagonals are of different lengths.

Special case obviosuly being a square with both diagonals of the same lenght as well as the all sides of same length.
Correcting slip by ausgmat2008,

Pls read area of a rhombus as 1/2 (diag1 * diag2) [ half of the product of diagonals ]
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