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Circle on transverse axis as diameter?

Ax² + y² = a²
Bx² + y² = b²
Cx² + y² = a² + b²
Dx² + y² = a² − b²
Answer & Solution
Correct answer: A. x² + y² = a²
The transverse axis has length 2a, so the circle has radius a and centre at the origin.
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