ok, here i think is a possible answer:
Rotate 90 degrees the window so the diagonal is his height.
Explanation:
the window is a square, you conect the two pairs of non adyacent corners and you have a square with twice of the area:
now every edge of the square has the size of the diagonals, if the size of an edge in the original square was “A”, the size of the new square will be for phytagoras theorem: (A) sqroot2–> the original area was A*A the new area is the double: 2* A*A
note: tha windows is gonna be open from his diagonal.

The first window is a rhombus with equal diagonals D.

Then let’s make a square window with each side the same length as the rhombus’ diagonal D
(the width and height remain the same between the two windows).

The area of the first window is ½D^2
The area of the second window is D^2

So the area of the second window is twice the area of the first and.

The only guess I have is to make 4 panes into triangles w/ equal heights as the sides and make a “pyramid” out of it. Height and width remains the same but surface area is multiplied by 2….

At this point we have 4 windows each taking up 1/4 of the full space; there are two windows on each door. Opening one of the doors means that there will now be three total windows, two taking up 1/4 of the space, one taking up 1/2 of the space. Therefore, the area of one of the windows has now been doubled.

ian| Guest November 25th, 2007 - 3:15 pmopen it up.

suineg| Guest November 25th, 2007 - 9:06 pmok, here i think is a possible answer:

Rotate 90 degrees the window so the diagonal is his height.

Explanation:

the window is a square, you conect the two pairs of non adyacent corners and you have a square with twice of the area:

now every edge of the square has the size of the diagonals, if the size of an edge in the original square was “A”, the size of the new square will be for phytagoras theorem: (A) sqroot2–> the original area was A*A the new area is the double: 2* A*A

note: tha windows is gonna be open from his diagonal.

Ari| Guest November 26th, 2007 - 6:59 amThe first window is a rhombus with equal diagonals D.

Then let’s make a square window with each side the same length as the rhombus’ diagonal D

(the width and height remain the same between the two windows).

The area of the first window is ½D^2

The area of the second window is D^2

So the area of the second window is twice the area of the first and.

Shawn| Guest November 26th, 2007 - 8:35 amdouble-pane window

Shawn| Guest November 26th, 2007 - 8:50 amOR, if the window has the shape of any acute triangle with a height of 10″ and a base width of 10″, then it would have 1/2 of the area of a 10″ square

Jenny| Guest November 26th, 2007 - 10:46 amOpen the Window up,

or put a giant magnify glass in front of it…

oscar| Guest November 26th, 2007 - 11:42 amDouble its thickness..

rrrrrr| Guest November 26th, 2007 - 12:20 pmwe should put a mirror

Misha| Guest November 26th, 2007 - 1:38 pmThe window is a diamond shape initially. When expanded into a rectangle, it keeps its same height and width but doubles its area.

Jay| Guest November 26th, 2007 - 2:25 pmThe only guess I have is to make 4 panes into triangles w/ equal heights as the sides and make a “pyramid” out of it. Height and width remains the same but surface area is multiplied by 2….

xena| Guest November 26th, 2007 - 5:02 pmThe window started off shaped as a triangle.

Filoso| Guest November 26th, 2007 - 6:36 pmuh? What about increasing the size length wise?

falwan| Guest November 26th, 2007 - 10:22 pmMake the word “window” twice as big.

falwan

brian| Guest November 27th, 2007 - 12:40 amopen the windows.

jennifer| Guest November 27th, 2007 - 8:20 amhow should i know?!?!?!?!?!?!

scott k| Guest November 27th, 2007 - 5:16 pmi guess u could say open the blinds so each adds half the windows width to each side of the window when viewed from the outside….

maybe… opening a window that rises straight up makes it twice as thick on that half of the window.

luagirl77| Guest November 27th, 2007 - 6:04 pmOpen the window.

Lady Mercy| Guest November 28th, 2007 - 1:14 amShall I hazard a guess?

Open the window in question.

RK| Profile November 28th, 2007 - 9:17 amcouple of good lateral thinking type answers given above…

what I had in mind is as Ari describes. I think Shawn & Suineg’s answers are similar in concept too

rmsphoto| Profile December 19th, 2007 - 12:00 pmEasy. Increase the depth. Bow the window either inward or outward, like the windows on custom vans from the ’70′s.

Roshkins| Profile February 17th, 2008 - 5:10 pmhow about the windows width = 0? Then Height = 0, so The Width = 2 * Height.

Seirei| Profile March 8th, 2008 - 1:10 pmAt this point we have 4 windows each taking up 1/4 of the full space; there are two windows on each door. Opening one of the doors means that there will now be three total windows, two taking up 1/4 of the space, one taking up 1/2 of the space. Therefore, the area of one of the windows has now been doubled.

Voila!

ponchai nandhayo| Profile October 29th, 2008 - 12:28 amopen the window

Smart Kit Puzzle Playground : Foo Thoughts| Guest December 14th, 2008 - 9:18 pm[...] Unique Window [...]