The length of a tangent drawn from an external point at distance $d$ from the centre of a circle of radius $r$ is given

Question

The length of a tangent drawn from an external point at distance $d$ from the centre of a circle of radius $r$ is given by —

Accepted Answer

$\sqrt{d^2 - r^2}$

Answer

$d + r$

Answer

$d - r$

Answer

$\sqrt{d^2 + r^2}$

The length of a tangent drawn from an external point at distance ddd from the centre of a circle of radius rrr is given by —