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An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. Since a triangle's angles must sum to 180° in Euclidean geometry , no Euclidean triangle can have more than one obtuse angle.
Isosceles triangles commonly appear in architecture as the shapes of gables and pediments. In ancient Greek architecture and its later imitations, the obtuse isosceles triangle was used; in Gothic architecture this was replaced by the acute isosceles triangle. [8]
For an acute triangle the distance between the circumcenter O and the orthocenter H satisfies [2]: p.26, #954 <, with the opposite inequality holding for an obtuse triangle. The circumradius is at least twice the distance between the first and second Brocard points B 1 and B 2: [38].
Acute and obtuse triangles; Automedian triangle; B. Brahmagupta triangle; C. ... Spherical triangle This page was last edited on 6 January 2022, at 06:29 (UTC). ...
A triangle in which one of the angles is a right angle is a right triangle, a triangle in which all of its angles are less than that angle is an acute triangle, and a triangle in which one of it angles is greater than that angle is an obtuse triangle. [8] These definitions date back at least to Euclid. [9]
A corollary of the Pythagorean theorem's converse is a simple means of determining whether a triangle is right, obtuse, or acute, as follows. Let c be chosen to be the longest of the three sides and a + b > c (otherwise there is no triangle according to the triangle inequality ).
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There are infinitely many pairs of 5-Con triangles, even up to scaling. The smallest 5-Con triangles with integer sides have side lengths (8; 12; 18) and (12; 18; 27). This is an example with obtuse triangles. An example of acute 5-Con triangles is (1000; 1100; 1210) and (1100; 1210; 1331).