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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.
This is an isosceles triangle that is acute, but less so than the equilateral triangle; its height is proportional to 5/8 of its base. [38] The Egyptian isosceles triangle was brought back into use in modern architecture by Dutch architect Hendrik Petrus Berlage. [39] Detailed view of a modified Warren truss with verticals
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]
An equilateral triangle may have integer sides with three rational angles as measured in degrees, [13] known for the only acute triangle that is similar to its orthic triangle (with vertices at the feet of the altitudes), [14] and the only triangle whose Steiner inellipse is a circle (specifically, the incircle).
Diagram to show that the circumcentre of an acute triangle is on the hypotenuse of the triangle. One in a series. Date: 13 April 2007: Source: Own drawing, Inkscape 0.45: Author: Inductiveload: Permission (Reusing this file)
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Other Images in the Series. Circumscription of acute triangle. ... Description=Diagram to show that the circumcentre of an obtuse triangle is outside the triangle.