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Re: DS: Coordinate Plane [#permalink]
02 Dec 2010, 12:27

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Expert's post

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This post was BOOKMARKED

JenniferClopton wrote:

A rectangle is plotted on the standard coordinate plane, with vertices at the origin and (12,0). What are the coordinates of the other two vertices?

(1) The length of the diagonal is 13 units.

(2) The distance between the origin and one of the other vertices is 5 units.

So we have two vertices O(0,0) and B(12,0). First note that OA may be either one of the sides or a diagonal.

(1) The length of the diagonal is 13 units --> clearly OA is not a diagonal, so it's one of the sides. Now, if we take the length of the other side to be equal to x then we'll have x^2+12^2=13^2 --> x=5. But from this we can not get the coordinates of the other vertices. As you correctly noted rectangle can be in I quadrant with the other two vertices at (0, 5) and (12, 5) OR in IV quadrant with the other two vertices at (0, -5) and (12, -5). Not sufficient.

(2) The distance between the origin and one of the other vertices is 5 units. Clearly insufficient.

(1)+(2) Still two answers are possible: (0, 5) and (12, 5) OR (0, -5) and (12, -5). Not sufficient.

Re: DS: Coordinate Plane [#permalink]
03 Dec 2010, 04:02

JenniferClopton wrote:

A rectangle is plotted on the standard coordinate plane, with vertices at the origin and (12,0). What are the coordinates of the other two vertices?

(1) The length of the diagonal is 13 units.

(2) The distance between the origin and one of the other vertices is 5 units.

The answr must be "E". Not "A". Please post the correct OA.

Here is the simle explanation.

Just imagine the rectangle in the co-ordinate place. You get the answer. No need to use any calculations/values.

The below shows the picture with two rectangles, one in red and another in green, which can be drawn for statement given and which have different co-ordinates except the two given in the question.

Re: DS: Coordinate Plane [#permalink]
03 Dec 2010, 07:59

even if it is implied the answer shud be D not A becoz 5 cant be the diagonal as one side is already 12 and the diagonal will be greater than both sides.

Re: A rectangle is plotted on the standard coordinate plane, [#permalink]
22 Jul 2014, 05:44

Bunuel wrote:

JenniferClopton wrote:

A rectangle is plotted on the standard coordinate plane, with vertices at the origin and (12,0). What are the coordinates of the other two vertices?

(1) The length of the diagonal is 13 units.

(2) The distance between the origin and one of the other vertices is 5 units.

So we have two vertices O(0,0) and B(12,0). First note that OA may be either one of the sides or a diagonal.

(1) The length of the diagonal is 13 units --> clearly OA is not a diagonal, so it's one of the sides. Now, if we take the length of the other side to be equal to x then we'll have x^2+12^2=13^2 --> x=5. But from this we can not get the coordinates of the other vertices. As you correctly noted rectangle can be in I quadrant with the other two vertices at (0, 5) and (12, 5) OR in IV quadrant with the other two vertices at (0, -5) and (12, -5). Not sufficient.

(2) The distance between the origin and one of the other vertices is 5 units. Clearly insufficient.

(1)+(2) Still two answers are possible: (0, 5) and (12, 5) OR (0, -5) and (12, -5). Not sufficient.

Answer: E.

How can a rectangle have two unequal parallel sides (12 & 13)?

Re: A rectangle is plotted on the standard coordinate plane, [#permalink]
22 Jul 2014, 05:48

Expert's post

hamzakb wrote:

Bunuel wrote:

JenniferClopton wrote:

A rectangle is plotted on the standard coordinate plane, with vertices at the origin and (12,0). What are the coordinates of the other two vertices?

(1) The length of the diagonal is 13 units.

(2) The distance between the origin and one of the other vertices is 5 units.

So we have two vertices O(0,0) and B(12,0). First note that OA may be either one of the sides or a diagonal.

(1) The length of the diagonal is 13 units --> clearly OA is not a diagonal, so it's one of the sides. Now, if we take the length of the other side to be equal to x then we'll have x^2+12^2=13^2 --> x=5. But from this we can not get the coordinates of the other vertices. As you correctly noted rectangle can be in I quadrant with the other two vertices at (0, 5) and (12, 5) OR in IV quadrant with the other two vertices at (0, -5) and (12, -5). Not sufficient.

(2) The distance between the origin and one of the other vertices is 5 units. Clearly insufficient.

(1)+(2) Still two answers are possible: (0, 5) and (12, 5) OR (0, -5) and (12, -5). Not sufficient.

Answer: E.

How can a rectangle have two unequal parallel sides (12 & 13)?

beats me

It cannot. Where in my solution is written this? _________________

Re: A rectangle is plotted on the standard coordinate plane, [#permalink]
22 Jul 2014, 06:05

(1) The length of the diagonal is 13 units.

(2) The distance between the origin and one of the other vertices is 5 units.[/quote]

So we have two vertices O(0,0) and B(12,0). First note that OA may be either one of the sides or a diagonal.

(1) The length of the diagonal is 13 units --> clearly OA is not a diagonal, so it's one of the sides. Now, if we take the length of the other side to be equal to x then we'll have x^2+12^2=13^2 --> x=5. But from this we can not get the coordinates of the other vertices. As you correctly noted rectangle can be in I quadrant with the other two vertices at (0, 5) and (12, 5) OR in IV quadrant with the other two vertices at (0, -5) and (12, -5). Not sufficient.

(2) The distance between the origin and one of the other vertices is 5 units. Clearly insufficient.

(1)+(2) Still two answers are possible: (0, 5) and (12, 5) OR (0, -5) and (12, -5). Not sufficient.

Answer: E.[/quote][/quote]

You say clearly OA is not a diagonal, it is one of the side. I think you are mentioning to two sets of parallel lines having length 12 & 13?

Also, how can 13 not be a diagonal, given that it has been explicitly mentioned in the question that it IS a diagonal.

Re: A rectangle is plotted on the standard coordinate plane, [#permalink]
22 Jul 2014, 06:31

Expert's post

hamzakb wrote:

You say clearly OA is not a diagonal, it is one of the side. I think you are mentioning to two sets of parallel lines having length 12 & 13?

Also, how can 13 not be a diagonal, given that it has been explicitly mentioned in the question that it IS a diagonal.

You are not reading the question and the solution carefully. Also, with geometry and coordinate geometry question it's always a good idea to make a sketch:

Attachment:

Untitled.png [ 8.01 KiB | Viewed 208 times ]

OA is NOT the diagonal it's one of the sides, diagonal = 13. Two possible rectangles.

Re: A rectangle is plotted on the standard coordinate plane, [#permalink]
22 Jul 2014, 07:27

Bunuel wrote:

hamzakb wrote:

You say clearly OA is not a diagonal, it is one of the side. I think you are mentioning to two sets of parallel lines having length 12 & 13?

Also, how can 13 not be a diagonal, given that it has been explicitly mentioned in the question that it IS a diagonal.

You are not reading the question and the solution carefully. Also, with geometry and coordinate geometry question it's always a good idea to make a sketch:

Attachment:

Untitled.png

OA is NOT the diagonal it's one of the sides, diagonal = 13. Two possible rectangles.

Hope it's clear now.

I get it. I didn't understand properly before.

Thanks a lot!! Your posts are the most helpful I've found on the net

gmatclubot

Re: A rectangle is plotted on the standard coordinate plane,
[#permalink]
22 Jul 2014, 07:27