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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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