In geometry and
trigonometry, 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. Where there is no possibility of confusion, the term "angle" is used interchangeably for
both the geometric configuration itself and for its angular magnitude (which is simply a numerical quantity).
The word angle comes from the Latin word angulus, meaning "a corner". The word angulus is a diminutive, of which
the primitive form, angus, does not occur in Latin.  Wikipedia
Standard unit = Radian (rad)
1 
1.667 · 10^{2} 
2.778 · 10^{4} 
4.848 · 10^{6} 
7.716 · 10^{7} 
60 
1 
1.667 · 10^{2} 
2.909 · 10^{4} 
4.630 · 10^{5} 
3600 
60 
1 
1.745 · 10^{2} 
2.778 · 10^{3} 
2.063 · 10^{5} 
3438 
57.30 
1 
0.1592 
1.296 · 10^{6} 
2.16 · 10^{4} 
360 
6.283 
1 
