subs y=x
x^2+x^2+ax+bx+c=0
2x^2+(a+b)x+c=0
menyinggung (D=0)
(a+b)^2-4(2)(c)=a^2+b^2+2ab-8c=0
a^2+b^2=8c-2ab ... (1)
dari pers lingkaran
r^2=(1/2a)^2+(1/2b)^2-c
r^2=1/4(a^2+b^2)-c
subs (1)
r^2=1/4(8c-2ab)-c
r^2=c-1/2ab
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subs y=x
x^2+x^2+ax+bx+c=0
2x^2+(a+b)x+c=0
menyinggung (D=0)
(a+b)^2-4(2)(c)=a^2+b^2+2ab-8c=0
a^2+b^2=8c-2ab ... (1)
dari pers lingkaran
r^2=(1/2a)^2+(1/2b)^2-c
r^2=1/4(a^2+b^2)-c
subs (1)
r^2=1/4(8c-2ab)-c
r^2=c-1/2ab