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| abstraction > mathematical concept > number > quantity > angle > phase angle | 
| phase angle | ||||
| subject | fact | |||
| phase angle | has definition The angle measured at the center of an illuminated body between the light source and the observer. | ![]()  | 
| is a kind of angle | ![]()  | |
| angle | has unit angle unit | ![]()  | 
| number | has value | ![]()  |