engineering mathematics MCQ #321

The radius of the circle x² + y² + 2x + 4y + 1 = 0 is

engineering mathematics MCQ #321

  1. Question 1

    Q1. The radius of the circle x² + y² + 2x + 4y + 1 = 0 is

    • A) √5
    • B) √6
    • C) 2
    • D) 3

    Answer: 2

    Explanation: The radius is given by √(g² + f² - c), where g = 1, f = 2, and c = 1, so √(1 + 4 - 1) = √4 = 2.