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Two poles of heights 15 m and 6 m stand 12 m apart. The distance between their tops is
A15 m
B18 m
C13 m
D21 m
Answer & Solution
Correct answer: A. 15 m
1. Horizontal distance = 12 m; height difference = 9 m.
2. Form a right triangle: d^2 = 12^2 + 9^2 = 144 + 81 = 225.
3. d = 15 m.
4. So the tops are 15 m apart.
_Source: Selina Concise Mathematics Class 9, Ch on Pythagoras Theorem (Mistral OCR'd PDF), section on application_
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