Tolong dibantu yak soal matematika Poltekes

Pusat = titik tengah AB = 1/2 (A + B)
= 1/2 ((3, -2) + (5, 8))
= 1/2 (8, 6)
= (4, 3)
Persamaan lingkaran
(x - 4)^2 + (y - 3)^2 = r^2 ==> melalui titik A(3, -2)
(3 - 4)^2 + (-2 - 3)^2 = r^2
1 + 25 = r^2
26 = r^2
(x - 4)^2 + (y - 3)^2 = 26
x^2 - 8x + 16 + y^2 - 6y + 9 - 26 = 0
x^2 + y^2 - 8x - 6y - 1 = 0