Changes

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.

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"

Angles are described as being:

 

There are several units used to measure angles, the most common are:

 

 

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.

 

 

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]]