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persamaan lingkaran:
x² + y² + Ax + By + C = 0
melalui (0,0)
0² + 0² + A(0) + B(0) + C = 0
C = 0
persamaan lingkarannya menjadi:
x² + y² + Ax + By = 0
melalui (1,3)
1² + 3² + A(1) + B(3) = 0
1 + 9 + A + 3B = 0
A + 3B = -10
melalui (-3,-2)
(-3)² + (-2)² + A(-3) + B(-2) = 0
9 + 4 - 3A - 2B = 0
3A + 2B = 13
eliminasi kedua persamaan didapat
A = 59/7
B = -43/7
jadi persamaan lingkarannya adalah