, p3, p1 p2. p3 . 3 .
8 , . 2.3.
. 2.3. 3 .
.
, p2 , . p1 x 12 90, p3 z 23 90 . y .
(. 2.4).
. 2.4. .
1, 2, 3 . :
1 x, y 1
2 x, z
A 3 y 3, z
x = 30, y = 25, z = 35. 1 2. 2 3 , z ( OA z), 1 y 1, OA y ( y) y 3 ( ) 2. 1 3 , .. p3 p2 .
3 , .
, .
I | II | III | IV | V | VI | VII | VIII | |
x | + | + | + | + | - | - | - | - |
y | + | - | - | + | + | - | - | + |
z | + | + | - | - | + | + | - | - |
2.3 .
, .
, .
(. 2.5, 2.6).
(x = 30, y = 25, z = -35) IV . 1 x . 2 z. 3 1 2 y = 25, z = -35.
(x = -30, y = 40, z = 30) V . 1 z x . 2
. 2.5. 4 5 .
. 2.6. 4 5 .
z. 3 1 2 y = 40, z = 30.
|
|
, .
= 0, p3.
= 0, p2.
z = 0, p1.
(. 2.7, 2.8).
. 2.7. .
D (x = 0, y = 30, z = 20) p3 D 3, D 1 D 2 z.
(x = 30, y = 0, z = 35) p2 2, 1 3 x z.
(x = 40, y = 25, z = 0) p1 1, 2 3 x .
L (x = 0, y = 5, z = 40) z.
. 2.8. .
?
:
a) p1;
b) p2;
c) p3?
, :
a) A (x = 50, y = -10, z = -30);
b) B (x = -40, y = -20, z = 35);
c) C (x = -20, y = -30, z = -45);
d) D (x = -30, y = 0, z = -50);
e) E (x = 0, y = -40, z = 25).
3.
. .
, AB (. 3.1, 3.2).
. 3.1. .
1 1 ;.
2 2 ;.
3 3 .
. . 3.1 , (, 1 1 , 2 2 ), .
. 3.2. .
, , . .