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Pair of tangents are drawn from origin to the circle x2 + y2 – 8x – 4y + 16 = 0 then square of length of chord of contact is(1) 5/64 (2) 24/5 (3) 8/5 (4) 8/13 |
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Answer» Answer is (1) 64/5 L = √S1 = √16 = 4 R = √(16 + 4 - 16) = 2 Length of Chord of contact = 2LR/√(L2 + R2) = √(2 x 4 x 2)/√(16 + 4) = 16/√20 square of length of chord of contac = 64/5 |
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