Area of a box on the number line

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ELYAC Realty: Senior | Next Rank: 100 Posts; Posts: 30; Joined: Sat Aug 30, 2008 12:23 am; Location: Los Angeles CA

by ELYAC Realty » Tue Sep 02, 2008 9:15 pm

How can we not find the area if we know 2 points? If we know two points of a rectangle, then we know all 4 points?

Thanks

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Source: Beat The GMAT — Data Sufficiency | Tue Sep 02, 2008 9:15 pm

anju: Master | Next Rank: 500 Posts; Posts: 258; Joined: Thu Mar 29, 2007 3:15 amFollowed by: 1 member; Thanked: 7 times

Re: Area of a box on the number line

by anju » Tue Sep 02, 2008 9:27 pm

ELYAC Realty wrote:How can we not find the area if we know 2 points? If we know two points of a rectangle, then we know all 4 points?

Thanks

how will u get points for R n S
If u have points M and R (diagonals) then you can find N and S but if u just have M and N then you will not be able to find R and S
Consider:
M(2,1) and if R were (5,5) then you can find S to be (2,5) [2 - x coord of M and 5 - Y coord of R]
but with the provided info you cannot determine R and S
Having M, you can find the x coord of S but not the y coord. Similarly for R you can find x coord
i hope it's clear now

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ELYAC Realty: Senior | Next Rank: 100 Posts; Posts: 30; Joined: Sat Aug 30, 2008 12:23 am; Location: Los Angeles CA

by ELYAC Realty » Tue Sep 02, 2008 9:36 pm

Yeah I see what you are saying. I think you meant to say that with the y cord of M you can find the y cord of S, and with the y cord of N you can find the y cord of R.

Thanks!

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anju: Master | Next Rank: 500 Posts; Posts: 258; Joined: Thu Mar 29, 2007 3:15 amFollowed by: 1 member; Thanked: 7 times

by anju » Tue Sep 02, 2008 9:39 pm

ELYAC Realty wrote:Yeah I see what you are saying. I think you meant to say that with the y cord of M you can find the y cord of S, and with the y cord of N you can find the y cord of R.

Thanks!

yep u are rt... it's y coord u can find not x.

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