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maka
3y = y + 5 + 5
2y = 10
y = 5
diperoleh
2x = 5 + 5
2x = 10
x = 5
Jadi lingkaran tsb berpusat di O(0,0) dan melalui (5, 5)
Jari-jari r^2 diperoleh 50
sehingga persamaan lingkaran tsb adalah