CBSE Class 10-Mathematics: Chapter –9 Some Applications of Trigonometry Part 7
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Question 8:
A round balloon of radius r subtends an angle at the eye of the observer while the angle of the elevation of its center is . Prove that the height of the center of the balloon is .

A Round Balloon of Radius
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Answer:
In right
In right ,
Question 9:
An aeroplane flying horizontally 1 km above the ground is observed at an elevation of . After seconds, its elevation is observed to . Find the speed of the aeroplane in .

An Aeroplane Flying Horizontally
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Answer:
In right ,
In right
Speed