, ( ) , . , - Δ .
.
1. π4 :
(hÌΔ)Ù(h p1); p4 ^ h;
1 h1/: 1 ^ h1/; (.10.1)
.10.1.
2. - 1 //1 //1//.
[S// Sx// ] [S1// Sx1//]; [A// Ax// ] [A1// Ax1//]; [B// Bx// ] [B1// Bx1//];
[C// Cx//] [C1// Cx1//];
p4 (.10.2).
.10.2.
3. S1 D111, , :
S1K1 S1; S1K1 D111 ; S1K1∩D111 =K1;
: S1"K1" DA1// 1// C1//;
[S1"K1"] . .
, S1 /K / (.10.3);
.10.3.
3. - D.
.
-DABC, , .
:
1) .
2) ,
ΔA1B1C1 . p2 , . p1, .
a1(A1B1C1) a2(A2B2C2)// p1 ;
.
1. , (. 1).
2. DA2B2C2 [A2//B2//C2//] :
a2////
:
[A2//B2//C2//] [A1//B1//C1//] (.11.1)
.11.1.
3. 1/, 1/, ... 2/,2/,.... . DA2B2C2 (ΔA2/B2 C2/), : [DA2/B2/ C2/] [DABC] (.11.2)
.11.2.