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Some Applications of Trigonometry
CH09 Question Bank
CBSE_CH09_QUESTION_BANK
Grade 10
Question:
A pole is observed from a point $20$ m from its base, with an angle of elevation of $45^\circ$. The height of the pole is:
$10$ m
$20$ m
$20\sqrt2$ m
$40$ m
$10$ m
$20$ m
$20\sqrt2$ m
$40$ m
Step-by-Step Solution
Key Concept: Since tan45° = 1, height equals distance.
$\tan45^\circ=\dfrac{h}{20}\Rightarrow 1=\dfrac{h}{20}\Rightarrow h=20$ m. [1.0 Mark]
Correct Answer: $20$ m
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