Definition of Obtuse-angled triangle 1. Noun. A triangle that
contains an obtuse interior angle. Obtuse-angled Triangle
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angled Triangle Literary usage of Obtuse-angled triangle Below
you will find example usage of this term as found in modern
and/or classical literature: 1. The Elements of Euclid: The
Errors, by which Theon, Or Others, Have Long Ago by Robert
Simson, Euclid (1829) "An obtuse-angled triangle, is that which
has an obtuse angle. XXIX. An acute-angled triangle, ...
obtuseangled triangle ..." 2. The Elements of Geometry by George
Bruce Halsted (1886) "An obtuse-angled triangle has one of its
angles obtuse. 121. An Acute-angled Triangle has all three
angles acute. 122. ..." 3. The Kindergarten Guide: An
Illustrated Hand-book, Designed for the Self by Maria Kraus-
Boelte, John Kraus (1881) "40, representing a sun-shade