The height of a tower is 200 m, when the elevation of the sun is $30°$ , then the length of its shadow is

AB$=$  Height of tower

BC $=$  length of shadow

$\tan 30°=\frac{AB}{BC}$

$\frac{1}{\sqrt{3}}=\frac{200}{BC}$

$BC=200\sqrt{3}$  mts

Length of shadow $=$ 200 $\sqrt{3}$  mts