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Figure 13
The two triangles whose corners make up the pair of corner markings on a well arrowed tile are always of the same size. Here the pair of triangles is shown in black. The matching on opposite sides of triangles leads to the red and green matched triangles. Since these too must match, we see that all four triangles are of the same size. Note that there is no presumption here about how these triangles lie in larger triangles.

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ISSN: 2053-2733
Volume 73| Part 3| May 2017| Pages 246-256
https://doi.org/10.1107/S2053273317003576
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