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Verified answer
Jari-jari lingkaran adalah jarak pusat lingkaran ke garis x + y + 3 = 0r = | 2 - 1 + 3 | / V( 1^2 + 1^2)
r = | 4 | / V2
r = 2V2
L : (x -2)^2 + (y - - 1)^2 = (2V2)^2
L : (x -2)^2 + (y + 1)^2 = 8
L : x^2 -4x +4 + y^2 + 2y + 1 = 8
L : x^2 + y^2 -4x + 2y -3 = 0
....(B)