engineering mathematics MCQ #470

The equation of the chord of contact of the tangents drawn from (x₁, y₁) to the circle x² + y² = a² is

engineering mathematics MCQ #470

  1. Question 1

    Q1. The equation of the chord of contact of the tangents drawn from (x₁, y₁) to the circle x² + y² = a² is

    • A) xx₁ + yy₁ = a²
    • B) xx₁ + yy₁ = x₁² + y₁²
    • C) xx₁ - yy₁ = a²
    • D) xx₁ - yy₁ = x₁² + y₁²

    Answer: xx₁ + yy₁ = a²

    Explanation: The chord of contact for tangents from (x₁, y₁) to x² + y² = a² is xx₁ + yy₁ = a², derived from the tangent equation.