persamaan garis singgung lingkaran
=0 di titik (7,1) adalah....
a. 3x-4y-41=0
b. 4x+3y-55=0
c. 4x-5y-53=0
d. 4x+3y-31=0
e. 4x-3y-40=0
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a = -1/2 x -6
= 3
b = -1/2 x 4
= -2,
jadi titik pusatnya 3,-2
cri r =
jadi r = 5
r^2 =25,
jadi masukkan ke persamaan lingakarn melalui titik (x-a)(x1-a) + (y-b)(y1-b) =r^2
jadi persamaannya 4x +3y - 31 = 0, terima kasih :) semoga membantu