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y=x+2
substitusi ke x^2+y^2=4
x^2+(x+2)^2=4
x^2+x^2+4x+4-4=0
2x^2+4x=0
x^2+2x=0
x(x+2) =0
x=0 atau x=-2
jika x=0, maka y=0+2=2
jadi titik potong pertama (0,2)
jk x=-2, maka y=-2+2=0
jadi titik potong kedua (-2,0)
jarak kedua titik