The angle of elevation of the top of a tree from a point 27m away...
MATHEMATICS
WAEC 2018
The angle of elevation of the top of a tree from a point 27m away and on the same horizontal ground as the foot of the tree is 30o. Find the height of the tree.
- A. 27m
- B. 13.5 \(\sqrt{3m}\)
- C. 13.5 \(\sqrt{2m}\)
- D. 9\(\sqrt{3m}\)
Correct Answer: D. 9\(\sqrt{3m}\)
Explanation
tan 30\(^o\) = \(\frac{h}{27}\)
h = 27 tan 30\(^o\)
= 27 x \(\frac{1}{\sqrt{3}}\)
= \(\frac{27}{\sqrt{3}}\) x \(\frac{\sqrt{3}}{\sqrt{3}}\)
= \(\frac{27 \sqrt{3}}{3}\)
= 9\(\sqrt{3m}\)
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