Find the equation of the circle whose centre is at (2, 4) and radius is equal to 5 units ?

1
x2 + y2 - 4x - 8y - 5 = 0
2
x2 + y2 + 4x - 8y - 5 = 0
3
x2 + y2 - 4x + 8y - 5 = 0
4
x2 + y2 + 4x + 8y + 5 = 0

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