If a line is drawn through a point A(3, 4) tocut the circle x2 +y2 = 4 – InterviewSolution

1.

If a line is drawn through a point A(3, 4) tocut the circle x2 +y2 = 4 at P and Q then APAQ

Answer»

By putting the point A(3,4) in the equation x²+y²-4 = 0

we get length of tangent as √3²+4²-4 = √21

now T² = AP.AQ

so, AP.AQ = (√21)² = 21.

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