Respostas

2013-12-08T17:56:26-02:00
oiê,te achei aqui sem querer :p


a) origem=0
    raio=4
(x-0)²+(y-0)²=4²


b) (x-(-2))²+(y-5)²=3²
    (x+2)²+(y-5)²=9



c) (x-3)²+(y-(-2)²=
√7 ²
    (x-3)²+(y+2)²= 7 


d)
dAB = √(6-2)²+(2-(-2))² =
√(4²+4²) =
√(16+16) =√32 = 4√2 

r = 2√2 

a = 2+6 / 2 = 8/2 = 4
b = 2+(-2) / 2 = 0/2 = 0

C(4,0)

(x- a)² +(y-b)² = r²
(x-4)² + (y-0)² = (2√2)²
(x-4)²+ y² = 2².2
(x-4)² +y² = 8


1 4 1