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Find the circle with centre (4, −1) that touches the Y-axis.
A(x − 4)² + (y + 1)² = 1
B(x + 4)² + (y − 1)² = 16
C(x − 4)² + (y + 1)² = 4
D(x − 4)² + (y + 1)² = 16
Answer & Solution
Correct answer: D. (x − 4)² + (y + 1)² = 16
The distance from the centre to the Y-axis is 4, which is the radius, so r² = 16.
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