alleryAuxiliary circle of ellipse x²/a² + y²/b² = 1:
Ax² + y² = a²
Bx² + y² = a² (circle on major axis as diameter)
Cx² + y² = b²
DRandom
Answer & Solution
Correct answer: B. x² + y² = a² (circle on major axis as diameter)
**Auxiliary circle:** circle with major axis as diameter.
**Used to parametrize ellipse:** (a cos θ, b sin θ) point on ellipse corresponds to (a cos θ, a sin θ) on auxiliary circle.
Useful for proofs and computations.
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