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Titik pusat = p (A/2, B/2)
Jari jari = r² = (A/2)²+(B/2)² -C
Persamaan umum lingkaran
x²+y²+ Ax +By+C = 0
1 A. P(2,1) r=6
B. P(-2,1)
C. P( 3,2 ) r = 4
D. P(-4,0) r = 5
E. P(3,9) r = 1