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Solution: You are in a hot air balloon, 400 m above the flat Texas plains. You look out toward the horizon.How far out can you see-that is, how far is your horizon? The Earths radius is about 6400 km.

Problem

You are in a hot air balloon, 400 m above the flat Texas plains. You look out toward the horizon.

How far out can you see-that is, how far is your horizon? The Earths radius is about 6400 km.