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The widely adopted form of two equal-length strokes connecting in an acute angle at the right, >, has been found in documents dated as far back as 1631. [1] In mathematical writing, the greater-than sign is typically placed between two values being compared and signifies that the first number is greater than the second number.
The straight lines which form right angles are called perpendicular. [8] Euclid uses right angles in definitions 11 and 12 to define acute angles (those smaller than a right angle) and obtuse angles (those greater than a right angle). [9] Two angles are called complementary if their sum is a right angle. [10]
Dihedral angle: 3-4: 159°05′41″ (159.09°) ... (right), which is the core of ... it has the same number of triangles as an icosahedron and the same number of ...
An angle equal to 1 / 4 turn (90° or π / 2 radians) is called a right angle. Two lines that form a right angle are said to be normal, orthogonal, or perpendicular. [12] 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").
A right angle is exactly radians. [7] ... its argument is a dimensionless number in ... 15 / 8 % or 1.875% smaller than the milliradian. For the small angles ...
The following list includes a decimal expansion and set containing each number, ordered by year of discovery. The column headings may be clicked to sort the table alphabetically, by decimal value, or by set. Explanations of the symbols in the right hand column can be found by clicking on them.
The six trigonometric functions are defined for every real number, except, for some of them, for angles that differ from 0 by a multiple of the right angle (90°). Referring to the diagram at the right, the six trigonometric functions of θ are, for angles smaller than the right angle:
u+2991 ⦑ left angle bracket with dot and u+2992 ⦒ right angle bracket with dot; u+27ea mathematical left double angle bracket and u+27eb mathematical right double angle bracket; u+2329 ⟨ left-pointing angle bracket and u+232a ⟩ right-pointing angle bracket, which are deprecated [4]