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Which circle x² + y² = r² is touched by the line 4x + 3y = 10?
Ax² + y² = 4
Bx² + y² = 2
Cx² + y² = 10
Dx² + y² = 16
Answer & Solution
Correct answer: A. x² + y² = 4
The distance from the origin to 4x + 3y − 10 = 0 is 10/5 = 2, so r = 2 and r² = 4.
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