Question

The length of the transverse common tangent of the circles $x^2 + y^2 - 2x + 4y + 4 = 0$ and $x^2 + y^2 + 4x - 2y + 1 = 0$ is

• A. $\sqrt{3}$
• B. $\sqrt{17}$
• C. $\sqrt{15}$
• D. 3

Answer 1

Answer: (D)

3

Answer 2

Answer (d) 3