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Jarak antara ujung2 diameter,
(5,-2) dan (-3,8)
= √(∆x² + ∆y²)
= √((5 - (-3))² + (-2 - 8)²)
= √(64 + 100)
= 2√41 satuan
r = 1/2 diameter
r = √41
r² = 41
Pusat lingkaran (x,y)
(5,-2) dan (-3,8)
x = (5 + (-3))/2
x = 1
y = (-2 + 8)/2
y = 3
Persamaan lingkaran dg P(1,3) dan r² = 41 :
(x - 1)² + (y - 3)² = 41
x² - 2x + 1 + y² - 6y + 9 - 41 = 0
x² + y² - 2x - 6y - 31 = 0