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L2 : x²+y²-10x-12y+47 = 0
---------------------------------- -
8x + 6y - 46 = 0
---------------------------------- : 2
4x + 3y - 23 = 0
4x = 23-3y
x = ..
subtitusikan ke salah satu persamaan lingkaran'
L1 : ()²+y²-2()-6y+1=0
+y²- () -6y+1=0
-------------------------------------------------------------------------------------- x 16
(23-3y)²+16y²-8(23-3y)-96y+16 = 0
529-138y+9y²+16y²-184+24y-96y+16 = 0
25y²-210y+361 = 0
D = b²-4ac
= (-210)²-4(25)(361)
= 8000
y₁ =
=
= 4,2+0,8
y₂ =
=
= 4,2-0,8
untuk mencari nilai x,
subtitusikan y₁ & y₂ ke persamaan x
x₁ =
= (23-12,6-2,4√5) / 4
= 2,6 - 0,6√5
x₂ =
= (23-12,6+2,4√5) / 4
= 2,6 + 0,6√5
sehingga titik potong kedua lingkaran
(2,6-0,6√5 ; 4,2+0,8√5) dan
(2,6+0,6√5 ; 4,2-0,8√5)
Sehingga panjang tali busur :
d =
d =
=
=
=
= 2
silahkan di recheck process nya sebelum menjadi jawaban akhir
semoga membantu