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Area of rectangle

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mendelay

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Joined: 21 Jul 2009
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Kudos [?]: 40 [0], given: 23

Area of rectangle [#permalink] New post 02 Sep 2009, 16:23
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A
B
C
D
E

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Question Stats:

100% (03:29) correct 0% (00:00) wrong based on 2 sessions
A small, rectangular park has a perimeter of 560 feet and a diagonal measurement of 200 feet. What is it's area, in square feet?

A) 19,200
B) 19,600
C) 20,000
D) 20,400
E) 20,800

[Reveal] Spoiler:
A

Last edited by mendelay on 17 Sep 2009, 08:07, edited 2 times in total.
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Kudos [?]: 61 [0], given: 12

Re: Area of rectangle [#permalink] New post 02 Sep 2009, 16:40
Let a and b are the sides of rect.

=> 2*(a+b) = 560

=> a+b = 280


Also, Diagonal = a^2 + b^2 = (200)^2


=> (a+b)^2 - 2ab = (200)^2

=> (280)^2 - (200)^2 = 2ab

=> ab = 19,200
Re: Area of rectangle   [#permalink] 02 Sep 2009, 16:40
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