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Verified answer
LingkaranDiameter = AB
= √((3 - 5)² + (-2 - 8)²)
= √(4 + 100)
= 2√26 satuan
Jari-jari = r = 1/2 AB = √26 satuan
Titik pusat (x,y)
x = 1/2 (3 + 5) = 4
y = 1/2 (-2 + 8) = 3
Persamaan lingkaran dg P(4,3) dan r = √26 :
(x - 4)² + (y - 3)² = (√26)²
x² - 4x + 16 + y² - 6y + 9 = 26
x² + y² - 4x - 6y - 1 = 0 → jawaban
X^2+ Y^2-8X-6Y-1