Multiple choice general knowledge math & puzzles What is the equation of a circle of radius 6 units centered at (3, 2)? x2 + y2 + 6x – 4y = 23 x2 + y2 - 6x – 4y = 23 x2 + y2 + 6x + 4y = 23 x2 + y2 - 6x – 4y = - 23 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The equation of a circle is (x-h)^2 + (y-k)^2 = r^2. For center (3,2) and radius 6, this is (x-3)^2 + (y-2)^2 = 36. Expanding gives x^2 - 6x + 9 + y^2 - 4y + 4 = 36, which simplifies to x^2 + y^2 - 6x - 4y = 23.