- . , . , , .
- . :
+ + =0,
, - .
:
( ).
(. 3.1). [ BA ]. . :
[ A 1 B 1]<[ BA ]; [ A 2 B 2]<[ BA;] [ A 3 B 3]<[ BA ].
) | ) | |
3.1. |
a - 1, b - 2, g - 3 :
½ 1 1½=½ BA ½cos a
½ A 2 B 2½=½ AB ½cos b
½ A 3 B 3½=½ AB ½cos g.
½ A 1 B 1½=½ A 2 B 2½=½ A 3 B 3½ g=b=a350, 450 .
(;a)b.
( ).
.
1 2 [ 1 1] [ A 2 B 2]. a b . (.3.2), [ ], [ 1 1] [ 2 2].
)a b | ) a b | |||
3.2. | ||||
a b g, , , [ 1 1] [ 2 2] x (.3.2.). , - . , , , . , - 2. 4. . (.3.3). | |
3.3. |
|
|
3-2