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Question

For a circle x2+y2=81, what is the equation of chord whose mid-point is (2,3)?

A
2x3y+13=0
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B
3x2y+13=0
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C
2x3y13=0
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D
2x+3y+13=0
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Solution

The correct option is A 2x3y+13=0
Equation of the required chord is T=S
2x+3y9=4+99
2x+3y=4+9
2x3y+13=0.

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