Feature Column from the AMS

Figures 2, 3, and 4

Figure 2. Escher's "framework."

Figure 3. Triangle with angles omega at X₁ and X₃, and pi - omega at X₂.

Figure 4. The similar triangles O₁AC andO₂AB.

These figures are reprinted from "The Trigonometry of Escher's Woodcut "CircleLimit III" by H. S. M. Coxeter, which originally appeared in theMathematical Intelligencer, Vol. 18 No. 4 (1996), 42-46. ©Copyright 1996 Springer-Verlag New York. Reprinted by permission ofSpringer-Verlag New York, Inc. FURTHER REPRODUCTION IS STRICTLY PROHIBITED.


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