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...are usually at right angles to the [[floor]]. Two things that are at right angles to each other are called "'''perpendicular'''" or "orthogonal". This is exp [[Plane (mathematics)|Planes]] (flat surfaces) can also meet at right angles. In a building, a wall and a floor are said to be perpendicular to each ot ...

...een 0 and 90 degrees, or between 0 and <math>\frac{\pi}{2}</math> radians. Angles larger than a right angle (90 degrees) are called [[Obtuse angle|obtuse]]. [[Category:Angles]] ...

In [[Geometry]], the '''golden angle''' is the smaller of the two [[Angle|angles]] created by sectioning the circumference of a circle according to the [[go [[Category:Angles]] ...

...labelled with the letters needed for this explanation. A, B and C are the angles. <math>a</math> is the side opposite <math>A</math>. <math>b</math> is the ...ulation]]. 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 ...

In [[mathematics]], angles can also be (and often are) measured in [[radian]]s instead of degrees, by Angles are studied in [[geometry]], where an angle where edges meet is often calle ...

| caption = This parallelogram is a [[rhomboid]] as it has no right angles and unequal sides. In all Parallelogram's opposite angles are equal to each other. ...

Triangles can also be grouped by their angles:<ref name=":0" /> * if a triangle has a [[right angle]], that is, if one of the angles of that triangle measures 90° (90 degrees), then it is a '''[[right triangl ...

...e [[coordinate system]]. If the point lies on the [[sphere]], only the two angles are needed, because the distance from the origin is known. ...

[[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 ...

===The sum of the interior angles of a polygon=== ...Here is an example when the starting value is 3: "The sum of the interior angles of a <math>n</math>-sided polygon is <math>(n-2)180</math> degrees." ...

.../math> [[radian]]s, 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 ...

...jects do not need to have the same size. Two shapes are similar if their [[angles]] have the same measure and their sides are [[Proportionality|proportional] ...s very similar to [[congruence]]. Congruent shapes have the same sides and angles. Because of that, two shapes are congruent to each other if one can become ...

[[Category:Angles]] ...

...t angle]]s (90 degrees). The [[diagonal]]s of a square also cross at right angles. The angle between any diagonal and a side of a square is 45 degrees. A squ ...

'''Trigonometry''' (from the [[Greek language|Greek]] ''trigonon'' = three angles and ''metron'' = [[measurement|measure]]) is a part of elementary [[mathema ...ides 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 ...

...e:Angles on the unit circle.svg|right|thumb|Measuring from the [[x-axis]], angles on the [[unit circle]] count as positive in the [[counterclockwise]] direct ...ematics]] to have counterclockwise angles count as positive, and clockwise angles count as negative. ...

...[[Vertex (geometry)|corner]]s. It has interior angles of 162 and exterior angles of 18. ...

...07/https://www.mathplanet.com/education/geometry/points,-lines,-planes-and-angles/an-introduction-to-geometry|url-status=dead}}</ref> ...

[[Category:Angles]] ...

...end at a [[3D]] object. In 3D it is possible for three [[Right angle|right angles]] to meet, but in 2D this can't happen. But still, a 2D screen can show the ...