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What are the parametric equations of the circle x² + y² = r²?
Ax = r sin θ and y = r sin θ
Bx = r tan θ and y = r sec θ
Cx = r cos θ and y = r tan θ
Dx = r cos θ and y = r sin θ
Answer & Solution
Correct answer: D. x = r cos θ and y = r sin θ
A point at angle θ on a circle of radius r centred at the origin has coordinates (r cos θ, r sin θ).
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