UPSKILL MATH PLUS

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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.)