Low floor high ceiling tasks : in-cyclic quads

Sircar, Swati (2019) Low floor high ceiling tasks : in-cyclic quads. At Right Angles (5). pp. 47-50. ISSN 2582-1873

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Abstract

E very triangle has a circumcircle and an incircle. But is that true for every quadrilateral? Definitely not; there are quads which are not cyclic (recall that a quad with a circumcircle is called ‘cyclic’). But what about quads with incircles? In this Low Floor High Ceiling article, we not only explore the if and only if condition for a quad to have an incircle, but also reflect a certain duality. It is more fun if students are exposed to Tasks 1 and 2 before they learn the theorems related to cyclic quads.

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Articles in APF Magazines

Authors:

Sircar, Swati

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