Geodesic
Conics constructions by pins and string: tangential and physical properties
The Teaching of Mathematics, XXIV (2021) no. 1, p. 1 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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We introduce conic sections' construction by pins and string, without rigid linear components. In addition to well-known methods (as gardener's ellipse), we analyze some recent constructions based on tangent properties and, as an original contribution, extend these constructions to all kinds of conics. In this setting, the physical analysis of the string's tension permits us to smoothly analyze these constructions since the first years of high school. From a didactical perspective, we think that such ideas can be fruitfully adopted in laboratory activities to deepen the tangential properties of conics by a rich interaction between mathematics and physics. Furthermore, the simplicity of the required materials allows the introduction of these manipulative activities in distance learning.
Classification : 97D40, 97G40, 97U60 D40, G40, U60
Keywords: Conics, pin-and-string constructions, tangent properties, string tension. 
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     title = {Conics constructions by pins and string: tangential and physical properties},
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Pietro Milici; Massimo Salvi. Conics constructions by pins and string: tangential and physical properties. The Teaching of Mathematics, XXIV (2021) no. 1, p. 1 . http://geodesic.mathdoc.fr/item/TM2_2021_XXIV_1_a0/