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Using the wheel, string and protractor — and trigonometry — we would be able to work
out both the heights of landmarks and their distance away.
If you place the protractor horizontally and put it in line with the baseline, then hold your eye up to the central point, you can read off the angle between the baseline and the point you're interested in. You can also use it to measure vertical angles if you hold it vertically
and use a bob.
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