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12, 1( 1; 1) 2( 2; 2),
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, 0(x 0; y 0) k, :
y y 0 = k (x x 0). (3)
Ax + By + C = 0. (4)
.
(x 0; y 0), 1 2 ,
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y 1 = k 1 x + b 1, y 2 = k 2 x + b 2 :
. (6)
1. y 1 = k 1 x + b 1, y 2 = k 2 x + b 2 ,
k 1 = k 2. (7)
2. y 1 = k 1 x + b 1, y 2 = k 2 x + b 2 ,
. (8)
d 0(x 0; y 0) (4)
. (9)
R 0 (x 0; y 0)
(x x 0)2 + (y y 0)2 = R 2. (10)
(. 1)
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, 5 k 10 =
k = 0 P (1; 7), k = 4 F (5; 1).
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9 (x 2 + 2 x + 1 + y 2) = x 2 + 8 x + 16.
8 2 + 10 + 9 2 +(7) = 0 =
= .
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