Teaching UP TGT Mock Test Series 2025 Mathematics Parabola, Ellipse and Hyperbola Tangents and Normals to Conics

If ax + by = c is tangent to the circle x2 + y2 = 16 then

1
16(a2 + b2) = c2
2
16(a2 - b2) = c2
3
16(a2 + b2) = -c2
4
16(a2 - b2) = -c2
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