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x² + y² - 6x + 8y + 25 - 9 = 0
x² + y² - 6x + 8y + 16 = 0
A = - 6
B = 8
C= 16
Pusat (A/ -2 , B/ - 2 ) = (- 6 / -2 , 8 / -2)
= (3 , -4)
r = √ a² + b² - C
=√3² + ( -4)² - 16
= √ 9 + 16 - 16
=√ 9
= 3