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A firefighter's ladder of length 13 m was kept at a distance of 5 m from a building to reach a window on the building. At what height is the window from the ground:

0
A) 15 m
B) 10 m
C) 20 m
D) 12 m

Correct Answer: D) 12 m

SMART TRICK: Jab bhi ladder aur wall ka problem ho, Pythagorean Theorem (a² + b² = c²) apply karein. Yahan Ladder hypotenuse (13m) hai, aur Base (5m) hai. Hamein Height (Perpendicular) maloom karni hai. 13² = 5² + Height². 169 = 25 + Height². Height² = 169 - 25 = 144. Iska square root lene se Height = 12m aayegi. Option (B) bilkul theek hai.

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