( ν) . 1 (. 56) . 3 , . 2 4 5 . - 6 . 30 . 0 360º. 0-180º , . : , . , -, .
, , -, 0.
. 56.
, (. 57). , - . , . 57, , ν 0.
. 57.
;
,
ν = 0, (41.1)
. , . 57, , 0.
ν = 360º + 0 ν = 0 - (41.2)
(41.1) (41.2) 0 ν,
0 = ( + )/2; (41.3)
ν = ( )/2. (41.4)
0 (41.1)-(41.4)
( 0 60º) 360º.
30 , v 0
v = ( 180)/2; 0 = ( + + 180)/2; (41.5)
v = 0 180; (41.6)
ν = 0 (41.7)
, 0, 90, 360º.
230 + , . , .
3
8