** Zaharinov, Todor
**
** The Simson triangle and its properties, 17 (2017) 373--381. **

** Orthopoles, flanks, and Vecten points, 17 (2017) 401--410. **

**
**** Zhang, Yong
**
** (with J. Peng) Heron triangle and rhombus pairs with a common area and a common perimeter, 17 (2017) 419--423. **

**
**** Zhang, Zhi-Hua
**
** (with Y. D. Wu) The edge-tangent sphere of a circumscriptible tetrahedron, 7 (2007) 19--24. **

**
**** Zhou, Li
**
**Do dogs play with rulers and compasses?, 15 (2015) 159--164.**

**Do dogs know the bifurcation locus?, 17 (2017) 45--46.**

**Primitive Heronian triangles with integer inradius and exradii, 18 (2018) 71--77.**

**
**** Zimba, Jason
**
**On the possibility of trigonometric proofs of the Pythagorean theorem, 9 (2009) 275--278. **

**
**** Ziv, Barukh
**
**Napoleon-like configurations and sequences of triangles, 2 (2002) 115--128. **

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