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The equation of the unit circle centred at the origin is
Ax^2 + y^2 = 2
Bx^2 + y^2 = 0
Cx^2 + y^2 = 4
Dx^2 + y^2 = 1
Answer & Solution
Correct answer: D. x^2 + y^2 = 1
Radius 1 centred at the origin gives x^2 + y^2 = 1^2.
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