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Verified answer
Jawab1)
Pusat (0,0) , r =jarak pusat ke gris 4x - 3y - 50 =0
x^2 + y^2 = r^2
|r| = 4(0) - 3(0) - 50 / √(4^2+3^2)
| r | = | -50/ 5|
r = 10
pers ling x^2 +y^2 = 10^2
atau x^2 + y^2 = 100
2,
x^2 + y^2 - 4x - 2y - 31= 0
(x^2 - 4x) + (y^2 -2y) = 31
(x - 2)^2 + (y -1)^2 = 31 + 2^2 + 1^2
(x - 2)^2 + (y - 1)^2 = 36
P(2,1)
r = √36
r = 6