Question

Tangents are drawn from any point on the circle $x^2+y^2=R^2$ to the circle $x^2+y^2=r^2$. If the line joining the points of intersection of these tangents with the first circle also touch the second, then R equals

• A.
• B.
• C.
• D.

Answer 1

The correct option is B


$\Delta ABC$ is equilateral
Circum radius = 2 (in radius)
R = 2r