Changes

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.

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 from their vertex. 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 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"