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Angle

Definition: An angle (in full, plane angle) is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. The magnitude of the angle is the "amount of rotation" that separates the two rays, and can be measured by considering the length of circular arc swept out when one ray is rotated about the vertex to coincide with the other.
Source: http://en.wikipedia.org/wiki/Angle

Example: A straight line with a vertex in the middle can be considered an angle of 180 degrees. A straight line with a vertex on an end can be considered an angle of 0 or 360 degrees.
3:51am 6/14/2015
User: Ayoub
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In planar geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.[1] Angles formed by two rays lie in a plane, but this plane does not have to be a Euclidean plane. Angles are also formed by the intersection of two planes in Euclidean and other spaces. These are called dihedral angles. Angles formed by the intersection of two curves in a plane are defined as the angle determined by the tangent rays at the point of intersection. Similar statements hold in space, for example, the spherical angle formed by two great circles on a sphere is the dihedral angle between the planes determined by the great circles. عيد الفطر 2015 صور عيد الفطر مسجات عيد الفطر رسائل عيد الفطر عيد الفطر 2015 صور عيد الفطر مسجات عيد الفطر رسائل عيد الفطر عيد الفطر 2015 صور عيد الفطر مسجات عيد الفطر رسائل عيد الفطر