Question

determine a equação reduzida da circunferência:
a)c(2,-1)r =2
d)c(-3,3)r = -1
c)c0,0)r = 4
d)c(9,-2)r = 13​

Answer 1

a)

c(2,-1)r = 2

(x - 2)^2 + (y + 1)^2 = 4

b)

c(-3,3)r = -1

(x + 3)^2 + (y - 3)^2 = 1

c)

c(0,0)r = 4

x^2 + y^2 = 16

d)

c(9,-2)r = 13

(x -9)^2 + (y + 2)^2 = 169