8. Find the height of the flag post

A girl observes the top of the flag post at an angle of 30$^{\circ}$ from the hot air balloon, which is at a height of 130 $m$ above the ground. If the distance between the flag post and the line drawn beneath the balloon is 21 $m$, then find the height of the flag post. (Use $\sqrt{3} = 1.732$)

 

Answer:

 

The height of the flag post is  $m$.

 

(Note: If the answer is a whole number, write as it is. If not, round off to $3$ decimal places.)