# How far can you see?

- Author:
- shanlee, Stuart Payne

- Topic:
- Geometry

The diagram below shows how the height of an object affects how much of the Earth can be seen from the object.
The red dot, which could represent a satellite, can be moved to change its height.
Find a formula to find the visible arc length on Earth, given the height of the satellite.
Hint: https://ggbm.at/sWCWkWzJ