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4x²+4y²+4x-12y+1=0
x²+y²+x-3y+ 1/4 =0
jari jari
= √((-1/2 . 1) ² + (-1/2 . -3) ² - (1/4))
= √((1/4) + (9/4) - (1/4))
= √(9/4)
= 3/2