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On the Altitudes of Quadrilaterals
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Micale, Biagio; Pennisi, Mario – International Journal of Mathematical Education in Science and Technology, 2005
In this article quadrilaterals with concurrent maltitudes are characterized. A generalization of the maltitudes is given, and a larger family of quadrilaterals for which an analogous property of concurrency holds is determined and studied.
Descriptors: Mathematics, Geometric Concepts, Computer Software, Plane Geometry
Parallel Curves: Getting There and Getting Back
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Agnew, A. F.; Mathews, J. H. – International Journal of Mathematical Education in Science & Technology, 2006
This note takes up the issue of parallel curves while illustrating the utility of "Mathematica" in computations. This work complements results presented earlier. The presented treatment, considering the more general case of parametric curves, provides an analysis of the appearance of cusp singularities, and emphasizes the utility of symbolic…
Descriptors: Computation, Mathematics Education, Geometric Concepts, Equations (Mathematics)