Question 15
Coordinate GeometryFind the area of the circle whose equation is x2 + y2 − 4x + 8y + 11 = 0.
- A.3π
- B.6π
- C.9π
- D.12π
Show the answer and explanation
Answer: C (9π)
Explanation
Centre (2, −4); r² = 2² + (−4)² − 11 = 9. Area = πr² = 9π.
Find the area of the circle whose equation is x2 + y2 − 4x + 8y + 11 = 0.
Answer: C (9π)
Centre (2, −4); r² = 2² + (−4)² − 11 = 9. Area = πr² = 9π.