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b. x²+y² = 4
P(0,0), r =√4 = 2
c. P(3,-3), r = √36 = 6
d. P(4,2), r = √4²+2²-4
= √16
= 4
e. P(-3,6), r = √(-3)²+6²+4
= √49
= 7
f. P(-1,-2), r =√(-1)²+(-2)²+0
= √5