engineering mathematics MCQ #353

The equation x² + y² + 4x - 6y + 9 = 0 represents a circle. What is its radius?

engineering mathematics MCQ #353

  1. Question 1

    Q1. The equation x² + y² + 4x - 6y + 9 = 0 represents a circle. What is its radius?

    • A) 2
    • B) 3
    • C) 4
    • D) 5

    Answer: 2

    Explanation: Complete the square: (x+2)² + (y-3)² = 4. Radius = √4 = 2.