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In all Parallelogram's opposite angles are equal to each other. Angles which are not opposite in the Parallelogram will add up to 180 degrees. ...

...labelled with the letters needed for this explanation. A, B and C are the angles. {{math|a}} is the side opposite {{math|A}}. {{math|b}} is the side opposit ...0 degrees. The law of sines can also be used when two sides and one of the angles not enclosed by the two sides are known. In some such cases, the formula gi ...

[[File:Reflection angles.svg|frame|Diagram showing specular reflection]] ...as <math>\theta _i</math> and <math>\theta _r</math>) must be equal. Both angles have to be equal whenever reflection occurs. This is known as the "law of r ...

...r 2</math> radians, or 0 through 90 degrees. It is possible to have higher angles than that, however. Using the unit circle, two identities can be found: <ma ...

The sum of the interior angles of a <math>n</math>-sided polygon is <math>(n-2)180</math>degrees. The initial starting value is 3, and the interior angles of a triangle is <math>(3-2)180</math>degrees. ...

[[Category:Angles]] ...

'''Trigonometry''' (from the [[Greek language|Greek]] ''trigonon'' = three angles and ''metron'' = [[measurement|measure]]) is a part of elementary [[mathema ...sides of any triangle as soon as two sides and their included angle or two angles and a side or three sides are known. These laws are useful in all branches ...

...sagon''' is a twenty-sided [[polygon]]. The sum of any icosagon's interior angles is 3240 degrees. ...

...], the '''trigonometric functions''' are a set of functions which relate [[angles]] to the sides of a [[right triangle]]. There are many trigonometric functi ...tric functions specify the relationships between side lengths and interior angles of a right triangle.]] ...

...ns where the relationship between two points is most easily expressed with angles and distance; in the more familiar [[Cartesian coordinate system|Cartesian] [[Image:Polar graph paper.svg|thumb|right|300px|A polar grid with several angles labeled in degrees]] ...

...ger so that it points left and all your fingers are at [[right angle|right angles]] to each other. ...

...] to the negative [[gradient]] in the temperature and to the area at right angles, to that gradient, through which the heat is flowing: ...

...(''ɸ'' → 0) the spiral tends toward a straight line. The [[Complementary angles|complement]] of ɸ is called the ''pitch''. ...laxy such as the Milky Way. In general, arms in spiral galaxies have pitch angles ranging from about 10 to 40 degrees. ...

...tates that the multiplication of complex numbers is related to addition of angles. ...

...ar to shift slightly against the more distant background. These shifts are angles in a right [[triangle]], with 2 [[astronomical unit|AU]] making the short l ...

...ne in the plane of the molecule itself and one [[perpendicular]] (at right angles) to it. A symmetry plane [[Parallel (geometry)|parallel]] with the principa ...