= (, ), () :
= (, ) = cos (, ^ )
. , = = = .
.
.
- :
(, ) = = .
:
= { ax, ay, az }, = { bx, by, bz },
:
= ax bx + ay by + az bz;
= ;
.
× = [ , ], :
1) × : sin (, ^ );
2) × ;
3) , × , , , .. × .
. .
. || .
, : sin(, ^ ).
: = { ax, ay, az },
= { bx, by, bz }, × :
× =
= (aybz byaz) (axbz azbx) + (axby bxay) .
, ,
, (, , ), [ , ], . (, , ) = ( × ) .
10. : (, , )=(, , )= (, , ).
20. , , , (, , ) > 0; , , , (, , ) < 0.
30. , ,
, , , , , .
, , : = { a x, a y, a z}, = , = ,
(, , ) :
(, , ) =
= ax(bycz cybz) ay(bxcz bzcx) + az(bxcy cxby).
|
|
, , .
, . :
+ By + Cz + D = 0, (1)
= { A, B, C } , .
, 0 (x 0, y 0, z 0) = {A, B, C}:
A(x x 0) + B(y y 0) + C(z z 0) = 0.
:
,
, b, c c, .
, 1(x 1, y 1, z 1),
2(x 2, y 2, z 2), 3(x 3, y 3, z 3):
. (2)
, 1(x 1, y 1, z 1)
2(x 2, y 2, z 2) A(x x 0)+B(y y 0) + C(z z 0) = 0:
.
, 0(x 0, y 0, z 0) A 1 x + B 1 y + C 1 z + D 1 = 0 A 2 x + B 2 y + C 2 z + D 2 = 0:
= 0.
(x *, y *, z *) + By + Cz + D = 0 :
. (3)
, l, .
, 0(x 0, y 0, z 0) = { m, n, p }:
. (4)
,
1(x 1, y 1, z 1) 2(x 2, y 2, z 2):
. (5)
,
l
(0 £ £ ), l l ¢ .
= { A, B, C } = { m, n, p } l, j :
. (6)
.