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A special right triangle is a right triangle with some regular feature that makes calculations on the triangle easier, or for which simple formulas exist. For example, a right triangle may have angles that form simple relationships, such as 45°–45°–90°. This is called an "angle-based" right triangle. A "side-based" right triangle is one ...
English: This file illustrates the special right triangle of angles 30°, 60° and 90°. A black square represents the borders of the file. Inside, the triangle is depicted with all of its special angles. The right angle is symbolized by a small square, and its measure, 90°, is written to the right and above it.
Français : Ce fichier illustre le triangle particulier d'angles 45°, 45° et 90°. Dans celui-ci, le triangle est représenté avec tous ses angles et ses longueurs. L'angle droit est marqué d'un petit carré. À droite de l'angle droit, il y a un angle symbolisé par un arc, et sa mesure, 45°, est inscrite à gauche de l'arc.
Special pages; Printable version; Page information; ... == Summary == Diagram demonstrating the ratios of the sides of a 30-60-90 special right triangle. Created in ...
English: Special right triangles in a unit circle are helpful for remembering trig functions of multiples of 30 and 45 degrees. This figure illustrates cos(30) = sin ...
Pyramids and bipyramids are polyhedra with polygonal bases and triangles for lateral faces; the triangles are isosceles whenever they are right pyramids and bipyramids. The Kleetope of a polyhedron is a new polyhedron made by replacing each face of the original with a pyramid, and so the faces of a Kleetope will be triangles. [ 15 ]