Asked by singh
When a building under construction was observed from a point P on the ground which isi 120 meters away from its base, the angle of elevation of the top was 30°. Ater is demolition, when it was again observed from the same point in the angle changed to 60°. How much higher was the building raised, from the time it was first observed?
Answers
Answered by
oobleck
The building was taller after demolition? Very unusual.
Still, ratio of sides in a 30-60-90 triangle is 1:√3:2
So, the height changed from 120/√3 to 120√3
The difference is thus 120(√3-1/√3) = 138.56 m
Still, ratio of sides in a 30-60-90 triangle is 1:√3:2
So, the height changed from 120/√3 to 120√3
The difference is thus 120(√3-1/√3) = 138.56 m
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