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Re: Tuesday Q1 - # of Squares [#permalink]
13 May 2011, 12:19

vannu wrote:

IMO, OA is 12

We can draw 12 squares with one vertix at the origin. The regular 4 squares with all vertices on the x and y coordinates - 4 squares Tilt the side of a square to 45 degrees - 4 squares Tilt the side of the square to 60 degrees - 4 squares

Can you post a diagram and explain. I dont think your answer is right.

With 45 degree the diagonal will lie ong the X aix.

The co-ordinates of diagonal on X aixs will be (0,0) and (10\sqrt{2} , 0) _________________

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Re: how many squares ? [#permalink]
19 Aug 2011, 14:04

I am totally confused, shouldn't x and y be the same as it is a square and there are only 4 possibilities. Isn't it (+/- 10, 10) and (10, +/- 10)? Help Please! _________________

Re: how many squares ? [#permalink]
24 Aug 2011, 05:32

For the square to have an area of 100, the length of any one side of the square must be 10.

For this to be true, if one vertex of the square is given to be the origin (0,0) then we can take one vertex adjacent to this vertex as (x,y)

For the length of this vertex to be 10, using the distance formula, sqrt [(x-0)^2 + (y-0)^2] = 10 => x^2 + y^2 = 100

Therefore the possible coordinates of the adjacent vertex are the values of x and y which satisfy this equation. There are 12 such values (as detailed above), so there are 12 possible squares.

Note that (10,10) is not a solution for a vertex adjacent to (0,0) as its distance from (0,0) is not 10. _________________

Re: how many squares ? [#permalink]
24 Aug 2011, 15:51

Thank you very much Gyanone. Yes, (6,8) and (0,0) don't make the diagonal but one of the sides of the square. I got it now. Thank you again for the explanation. _________________

Re: Looking for modern floor lamps........ [#permalink]
25 Aug 2011, 04:56

1

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Hey dude I am not getting how you come with (6,8) and (8,6) as valid vertices point.

As per my knowledge... if we have one vertices to be (0,0) then one of vertices will lie on X axis (10,0) and other one must lie on Y axis (0,10) ..

So we are left with only one choice for fourth vertices... (10,10)

This is for 1 quadrants , as we have total 4 quadrants answer should be 4 .

Hope i have not done anything wrong here and i had understand question.

Please correct me if i am wrong

Thanks Vishal Shah

Distance between (0,0) and (6,8) or (8,6) will be 10.

And this distance will make the side of square. So do I think that the answer is 12 (3 square in 4 areas)

I still don't understand. The distance between (0,0) and (6,8) equals to 10 - you're right, but area of the square is not 100, but 48. Or where am I mistaken? 4 is correct IMO.