| 释义 |
perigon Geom.|ˈpɛrɪgən|
[irreg. f. peri- + Gr. γωνία angle.]
The angular magnitude traced out by a line in turning once completely around one end as centre; an angular quantity of 360 degrees, or four right angles.
1868A. Sandeman Pelicotetics 304 A right angle is both one half of a hemiperigon or a hemisemiperigon, and one fourth of a perigon. 1892G. B. Halsted Elem. Synth. Geom. 6 If we turn still more, until the moving ray has made a complete rotation..the angle is called a perigon. |