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=√3^2 + (-11)^
=√9 + 121
= √130
jari2 = 1/2 √130
titik pusat
a = (5+2)/2 = 3,5
b = (-3+8) / 2 = 2,5
(x - 3,5)² + (y - 2,5)² = (1/2√130)²
(x - 3,5)² + (y - 2,5)² = 130/4
(x - 3,5)² + (y - 2,5)² = 32,5
Jadi persamaannya (x - 3,5)² + (y - 2,5)² = 32,5