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Some Applications of Trigonometry
CBSE 2026 Board Exam Set 2 (Code 30/1/2)
CBSE_BOARD_PYQ_2026_30_1_2
Grade 10
Question:
[Section C]
A $1.5$ m tall boy is standing at some distance from a $30$ m tall building. The angle of elevation increases from $30^\circ$ to $60^\circ$ as he walks towards the building. Find distance walked.
A $1.5$ m tall boy is standing at some distance from a $30$ m tall building. The angle of elevation increases from $30^\circ$ to $60^\circ$ as he walks towards the building. Find distance walked.
Step-by-Step Solution
Key Concept: Two right triangles height 28.5 m.
Distance $= 28.5\sqrt{3} - 9.5\sqrt{3} = 19\sqrt{3}$ m. [3.0 Marks]
Correct Answer: Distance $= 19\sqrt{3}$ m
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