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Expanding the circle with centre (h, k) and radius r, what is the constant c in the general form?
Ah² + k² − r²
Bh² + k² + r²
Cr² − h² − k²
Dh + k − r
Answer & Solution
Correct answer: A. h² + k² − r²
Expansion gives x² + y² − 2hx − 2ky + (h² + k² − r²) = 0, so c = h² + k² − r².
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