A mountain or anything for that matter could be thousands of kilometres in land. How do they do it?
In: Engineering
You can use angles and trigonometry to measure things with line of sight
You can fill a tube with water, add all the twists and turns you want, and the two ends of the pipe will have water at the same level. We even still use this method today.
Mostly, we use surveying equipment with lasers. It’s all the same principles, but just more precise.
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