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(5-2)²+(-1-3)²=r²
9+16=r² .... r=5
2. Tentukan titik pusat dan jari jari lingkaran x²+y²-2x+6y+1=0
(x-1)²+(y+3)² -1 -9 +1=0
(x-1)²+(y+3)² -9 =0
(x-1)²+(y+3)² =3²
pusat(1,-3) jari2=3