.
4- :
( a,b)(a b) [(a1 b1) (a2 b2) (a3 b3)] (1)
, , :
[(a1 b1) (a2 b2)] (a3 b3) (2)
, (2) . (2) , . , .
.1 | . |
.2 | . |
.
3- :
(l m=A) (l1 m1=A1) (l2 m2=A2) (l3 m3=A3) (3)
, , .
.3 |
, , , .
.
(1) (3) , . , , ,
.4 | 1 2 2- , V , 3 4 H . a b |
.5 | a b |
7. .
: , , , , , , .
([AB] [BC]) ([AB] ,[BC] ) [A B ] [B C ]
.6 | : ABC=90 [AB] : A B C =90 |
[AB] [BC] .
[AB] [A B ]
[BC] [B C ]
ABB A - , [AB] BCC B , (AB BC AB BB ).
AB A B , A B A B BCC B , A B B C ,
.. A B C =90 .
.
:
.7 | : ABC=90 [AB] : A B C =90 |
[BC] =C
[AB] [BC] .
[AB] [A B ]
[BC] [B C ]
[DC] [A B ] [DC] [AB], BCD=90
3- : ( B CD=90 ) ( BCD=90 ) A B C=90 .
. .
:
.8 | h . C h. C h 90 h H, H, C h1( ). |C1D1|=|CD| |
III
|
|
- (1- ).
1. , .
:
- , .
2. .
3. , ( ).
() .
. , ().
, , . , .
:
.9 |
.10 |
.11 |
.12 |
.13 |
2. .
.14 | , , 3 . : PH= H - . PV= V - . PW= W - . |
:
Px= x=PH PV
Py= y=PH PW
Pz= z=PV PW,
, .
, ( 0 90 ), .
.15 | Px, Py Pz, Py1 Pz. |
.
, , :