Imagine that you are standing at point B, which is the length of BD above the ground. Which line segment in AABC do you think represents your line of sight
to the horizon?
Why do you think ABC is a right-angled triangle?
Assume that the radius of the Earth is 6370 km.
How can you use what you have learned in this section to calculate the
distance to the farthest object that you can see?
a If BD = 10 m, what would be the distance to the farthest object
that you can see?
b If BD = 382 m, what would be the distance to the farthest object
that you can see?
c Write an expression that represents the distance to
the farthest object you can see, if BD = h km