1 .
1 ( 1). . DEF, , . . 1; 1 . 2.
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1. 1 2 ( )
- | A | YA | ZA | B | YB | ZB | C | YC | ZC | D | YD | ZD | E | YE | ZE | F | YF | ZF |
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. . . , . , . , . . 2 1" 2" - β (β'). " F" " , '. (") N', N" .
, ( ). , 2" 5" , 5 2. 6' 4' , 6 , 4.
, . . , . , .
2 ( 1). . , (. . 1), SA = 60 .
. (. . 2) ABC . ('3' '1', "3" "2") , "3. , ( S S") . .
3 ( 2). . ABC ACD . , 15 . . 2. . 3.
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. , . . , , . π4 (''), ( π4 / π5 IV ≡ CIV). π5 V ≡ CV, VV, AV DV, lV. l, ABC ACD, .
. 3