Hello, symmetry!
You need a better diagram . . .
The tallest building in the world is the Sears Tower in the city of Chicago.
If the observation tower is 1450 feet above the ground,
how far can a person see standing in the observation tower
using the fact that Earth's radius is 3960 miles? Code:
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The height of the tower is
The radius of the earth is
The distance from the top of the tower to the horizon is
and form a right angle.
From the right triangle: .
. . which simplifies to: . [1]
We are told that: . and
Substitute into [1]: .
Therefore: . miles.