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A deltahedron is a polyhedron whose faces are all equilateral triangles. The deltahedron is named by Martyn Cundy , after the Greek capital letter delta resembling a triangular shape Δ. [ 1 ] The deltahedron can be categorized by the property of convexity .
There are several elementary results concerning similar triangles in Euclidean geometry: [9] Any two equilateral triangles are similar. Two triangles, both similar to a third triangle, are similar to each other (transitivity of similarity of triangles). Corresponding altitudes of similar triangles have the same ratio as the corresponding sides.
Solution of triangles (Latin: solutio triangulorum) is the main trigonometric problem of finding the characteristics of a triangle (angles and lengths of sides), when some of these are known. The triangle can be located on a plane or on a sphere. Applications requiring triangle solutions include geodesy, astronomy, construction, and navigation.
In geometry, the hinge theorem (sometimes called the open mouth theorem) states that if two sides of one triangle are congruent to two sides of another triangle, and the included angle of the first is larger than the included angle of the second, then the third side of the first triangle is longer than the third side of the second triangle. [1]
The three types of degenerate triangles, all of which contain zero area. A degenerate triangle is a "flat" triangle in the sense that it is contained in a line segment. It has thus collinear vertices [3] and zero area. If the three vertices are pairwise distinct, it has two 0° angles and one 180° angle.
A top Federal Reserve official said Monday that he is leaning toward supporting an interest rate cut when the Fed meets in two weeks but that evidence of persistent inflation before then could ...
The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = 13×5 / 2 = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent.
The woman accusing Jay-Z and Sean “Diddy” Combs of sexually assaulting her when she was 13 can proceed anonymously (“at least for now”) in her lawsuit against the rappers, a judge ruled ...