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256 II Seeing How It Works<br />

I can’t tell which of the two triangles<br />

I’m adding or subtracting. If I want a record of the triangles I’ve actually used, then this<br />

is a bother. Still, there are ways to keep track of things. I can resort to points again to<br />

distinguish the distinct cases—here for addition<br />

to get results like these<br />

Or I can stop worrying about it, and take advantage of the ambiguity—perhaps in this<br />

marvelous series that concludes with triangles and rectangles<br />

One of the reasons the catalogue of spatial relations I started with is so big is that<br />

the shape<br />

is a scalene triangle. For triangles with more symmetry, the size of the catalogue<br />

decreases. In particular, for the isosceles triangle

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