Something missing?

Geometry Level pending

Two friends A and B watched a car from the top of their buildings. Angle of depression for A was 15 degrees more than angle of depression for B, then

We cannot compare the heightsof two apartments A's apartment and B's apartment have same height A's apartment is taller than B's apartment B's apartment is taller than A's apartment

Ravneet Singh by Ravneet Singh , 30, India

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1 solution

Saya Suka
Dec 5, 2016

To be able to compare, one needs at least 3 of the distances involved.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Do you mean the horizontal distance between the car and the people? Because I forgot to consider that and got the wrong answer :(

Christopher Boo - 4 years, 6 months ago

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Any 3 distances will do. You have to realize that even though it looks like A's building must be taller because the depression angle is bigger, but B's could be taller if it's position is further away from the subject (car). For example, a toddler who looks down at the cat at his feet (depression angle 90) is not necessarily taller than his mommy who is looking at the same cat 10 feet away (depression angle definitely less than 90).

Saya Suka - 4 years, 6 months ago

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