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What is the area of rectangle ABCD? 1) Diagonal AC is twice

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CEO
Joined: 29 Mar 2007
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What is the area of rectangle ABCD? 1) Diagonal AC is twice [#permalink]  10 Nov 2007, 15:54
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What is the area of rectangle ABCD?

1) Diagonal AC is twice as long as side CD
2) Diagonal AC is .1 meters longer side AD

Is there a standard way to assign ABCD for rectangles. Also same goes for triangles ABC?

It seems from this question that there is no standard way.

Thx.
SVP
Joined: 29 Aug 2007
Posts: 2493
Followers: 59

Kudos [?]: 579 [0], given: 19

Re: DS- Rectangle [#permalink]  10 Nov 2007, 17:03
GMATBLACKBELT wrote:
What is the area of rectangle ABCD?

1) Diagonal AC is twice as long as side CD
2) Diagonal AC is .1 meters longer side AD

Is there a standard way to assign ABCD for rectangles. Also same goes for triangles ABC?

It seems from this question that there is no standard way.

Thx.

C. from i and ii only we know the size and relation of l and b.

so area = sqrt3
Director
Joined: 13 Dec 2006
Posts: 520
Location: Indonesia
Followers: 6

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From 1: suppose the length of side CD is X then Diagonal AC will be 2X, So we will have AD = sqrt3 *x^2 (By using pythagoras them) as we dont know the value of X, its insufficient.

From2: AD + 1 = AC ( since other values are unknown, its insufficient)

Now from 1 and 2 we will get the area of the triagle to be sqrt 3/ ((2-sqrt3)^2)...Sufficient

Amardeep
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