Advanced geometry for high schools : synthetic and analytical (1919)
McDougall, A. H. (Alexander Hiram), 1859-1946 · Toronto : Copp, Clark · leaf 75
ll As inscribed in a given acute-Zd A theal A has the least perimeter. If DEF be any A inscribedin ABC and FE be consideredfixed, by (a), the sum of FDand DE will be least whenZ FDB = Z EDC; thus for theminimum perimeter the sidesFD, DE must make equal Zswith BC. Similarly DF, EFmust make equal Zs…
Geometry · Geometry, Analytic
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