laright, I'll try to explain it as simple as possible.
The red triangle has less slope (it isn't as steep) as the green one. Therefore, because they are different slopes, although it appears to be the same shape.. it is now... see below. (look at the pink arrows. see how the triangles don't interesect the same points???)
Next, here is an over lay of teh two triangles... notice the difference between the two hypotenuse (LONG SIDES).
if you don't feel like reading, just look at this picture
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