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Line 1:
Line 1: − An '''angle''' was described by [[Euclid]] as "the inclination to one another of two lines which meet each other in the same [[plane]]." An angle is a bend formed by two intersecting [[line]]s or [[line segment]]s.+ + − Angles are described as being:+ + + + + + + + + + + Line 8:
Line 19: − A 180 degree angle is a straight line.
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The '''angle''' between two [[line]]s (or line segments) that have a point in common is the amount of rotation that separates the two lines. Note that the lines must have a point in common in order to define an angle between them.
Angles were described by [[Euclid]] as "the inclination to one another of two lines which meet each other in the same [[plane]], and do not lie straight with respect to each other"
==Units==
There are several units used to measure angles, the most common are:
Degree: Most commonly used in everyday life. It is defined as 1/360 of a full circle, therefore a circle has 360 degrees.
Radian: Most commonly used in science and engineering, is the angle subtended by an arc of a circle which have the same length as the circle radius. One full circle is equal to 2(<big><math>\pi</math></big>) radians, and one radian is 180/(<big><math>\pi</math></big>) degrees.
==Classification==
A simple way to classify angles is the following:
* [[Acute angle|acute]] (less than 90 [[degree]]s)
* [[Acute angle|acute]] (less than 90 [[degree]]s)
* [[Reflex angle|reflex]] (over 180 degrees)
* [[Reflex angle|reflex]] (over 180 degrees)
[[Category:Plane Geometry]]
[[Category:Plane Geometry]]