Write the equation of the circle with centre at (1,2) and radius 2 unit.
Answer (1)
Equation of the circle centre at (1,2) and radius 2 => (x-1)^2 + (y-2)^2 = 2^2
x^2 -2x + 1 + y^2 - 4y + 4= 4
x^2 -2x + y^2 - 4y + 1= 0
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