alleryA 5 m long ladder leans against a wall with its foot 3 m from the wall. The height it reaches up the wall is
A4 m
B3 m
C2 m
D5 m
Answer & Solution
Correct answer: A. 4 m
1. Ladder forms hypotenuse 5; wall-foot distance is 3.
2. Height squared = 5 squared minus 3 squared = 25 minus 9 = 16.
3. Hence height = 4 m.
_Source: syllabus Mathematics, Ch 6 "Triangles", §6.5_
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