The length of the tangent of a curve whose radius is T and angle of deflection $$\triangle$$ is

A

$$ R \tan \frac{\triangle}{2} $$

B

$$ 2R \sin \frac{\triangle}{2} $$

C

$$ 2R \tan \frac{\triangle}{2} $$

D

$$ R \sin \frac{\triangle}{2} $$