62. ? ( )
63. , ? ( )
()
64. . ( ):
65. , ( ?):
66. : ( ?)
0 º
67. () : ( )
= 
= 
= ( + ) ×2
= 
68. , , : ( ?)
ν =
ν =
ν = 
ν = 2( )
( )
d = l × Cos2 ν
d = l / Cos2 ν
d =2 l × Cos2 ν
d = 4 l× Cos2 ν
70. : ( ):
h = 0, 5×l× Sin2 ν
h = 0, 5× l / Sin2 ν
h = 2 l × Sin2 ν
h = 4 l × Sin2 ν
71. : ( ):
H = Hc. + h + i v
H = Hc. + h i v
H = Hc. h + i v
H = Hc. h + i v
72. ? ( ):
73. ( ):
74. , , ( ):
