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Re: Geometry Question-Not sure where they got the theory [#permalink]
03 Jun 2008, 06:40

Look at the first quadrant (x >0, y > 0) : x + y = 10, so we get a line segment with endpoints (0,10) and (10,0). We will get a square that can be broken up into 4 right triangles, each with area (10)(10)/2 = 50

Re: Geometry Question-Not sure where they got the theory [#permalink]
03 Jun 2008, 06:42

kevincan wrote:

Look at the first quadrant (x >0, y > 0) : x + y = 10, so we get a line segment with endpoints (0,10) and (10,0). We will get a square that can be broken up into 4 right triangles, each with area (10)(10)/2 = 50

but arent we only looking for the triangles in region 1 and 2?