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pers lingkaran
x^2 + y^2 = r^2 karena melalui (-3,1) maka
(-3)^2 + 1^2 = r^2 => r^2 = 10
jd pers lingkarannya x^2 + y^2 = 10
d = √((3 + 3)² + (-1 - 1)²)
d = √(6² + (-2)²)
d = √(36 + 4)
d = √40
d = 2√10
r = 1/2 d = 1/2 . 2√10 = √10
persamaan lingkarannya
x² + y² = r²
x² + y² = (√10)²
x² + y² = 10