engineering mathematics MCQ #543

The equation of the normal to the circle x² + y² = 25 at (3, 4) is?

engineering mathematics MCQ #543

  1. Question 1

    Q1. The equation of the normal to the circle x² + y² = 25 at (3, 4) is?

    • A) 4x - 3y = 0
    • B) 3x + 4y = 0
    • C) 4x + 3y = 25
    • D) 3x - 4y = 0

    Answer: 4x - 3y = 0

    Explanation: The normal at (x1, y1) to x² + y² = r² is y1*x = x1*y. Here, it's 4x = 3y, or 4x - 3y = 0.