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1.
:
● , 650 . ( );
● , 300 . ( );
● 1 ;
● 1 ( , );
● , 1 ;
● , 2 . .;
● , 150 ;
● , 4 . . ( );
● , , ;
● 1/2 .
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= 100
= 1
=150
( )
«»
= 400
=1
= 1
= 1/3 . .
( )
( ) = 1 . .
:
, . , , .
, , .
, ,
, , 180°.
, , . !
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