The triangles are actually different, upon closer inspection. They're really more like parallelograms. The main difference is in the slopes, the angles are a little different.
And I'm explaining this poorly. I'm tired. ;)
The two triangular components having different slopes, and thuse making the whole thing a parallelagram, instead of a true triangle, cause there to be a slight 'dent' in the hypotaneuse of the 'triangle'. Compare the heights of the whole figure at the edges of the front triangle in both images with the height on the other figure, and you can see they don't match up. This is where the hole 'goes' in the original view.
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And I'm explaining this poorly. I'm tired. ;)
The two triangular components having different slopes, and thuse making the whole thing a parallelagram, instead of a true triangle, cause there to be a slight 'dent' in the hypotaneuse of the 'triangle'. Compare the heights of the whole figure at the edges of the front triangle in both images with the height on the other figure, and you can see they don't match up. This is where the hole 'goes' in the original view.