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(x² - 4x + ...)+ (y²- 2y +...) - 11 - ... - ... = 0
(x² - 4x + 4)+ (y²- 2y + 1) - 11 - 4 -1 = 0
(x -2)² + (y-1)² = 16
P(pusat) = ( 2,1) R1 = 4
(x² + 20x + ...)+ (y² - 12y +...) +72- ...-... = 0
(x² + 20x + 100)+ (y² - 12y + 36) +72- 100- 36 = 0
(x +10)² +(y-6)² = 64
P= (-10,6) R2= 8
R1 +R2= 12
P1 ke P2 = (2-(-10), 1-6)
= (12, 5)
Panjang P1 P2 = √(12² + 5²)= √169 = 13
karena R1 + R2 < panjang P1P2 ( 12 < 13) , maka tidak berpotongan