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A rhombohedron has two opposite apices at which all face angles are equal; a prolate rhombohedron has this common angle acute, and an oblate rhombohedron has an obtuse angle at these vertices. A cube is a special case of a rhombohedron with all sides square.
The "triangle of U" diagram, showing the genetic relationships among six species of the genus Brassica. Chromosomes from each of the genomes A, B and C are represented by different colours. The triangle of U (/ uː / OO) is a theory about the evolution and relationships among the six most commonly known members of the plant genus Brassica.
An acute triangle (or acute-angled triangle) is a triangle with three acute angles (less than 90°). 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 ...
In an obtuse triangle (one with an obtuse angle), the foot of the altitude to the obtuse-angled vertex falls in the interior of the opposite side, but the feet of the altitudes to the acute-angled vertices fall on the opposite extended side, exterior to the triangle. This is illustrated in the adjacent diagram: in this obtuse triangle, an ...
Obtuse may refer to: Obtuse angle, an angle of between 90 and 180 degrees; Obtuse triangle, a triangle with an internal angle of between 90 and 180 degrees; Obtuse leaf shape; Obtuse tepal shape; Obtuse barracuda, a ray-finned fish; Obtuse, a neighborhood in Brookfield, Connecticut
An angle larger than a right angle and smaller than a straight angle (between 90° and 180°) is called an obtuse angle [11] ("obtuse" meaning "blunt"). An angle equal to 1 / 2 turn (180° or π radians) is called a straight angle. [10] An angle larger than a straight angle but less than 1 turn (between 180° and 360°) is called a ...
Commonly, many people think the structure of a chromosome is in an "X" shape. But this is only present when the cell divides. Researchers have now been able to model the structure of chromosomes when they are active. This is extremely important because the way that DNA folds up in chromosome structures is linked to the way DNA is used.
However, no algebraic expressions with purely real terms exist for the solutions of this equation, because it is an example of casus irreducibilis. The approximate relation of the sides is b ≈ 1.80193 ⋅ a , c ≈ 2.24698 ⋅ a . {\displaystyle b\approx 1.80193\cdot a,\qquad c\approx 2.24698\cdot a.}