Translations:Adventist Youth Honors Answer Book/Recreation/Wilderness Living/17/en

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Next, walk away from the tree so that you can see its top. Hold the ruler in front of your face, such that the line of sight from your eye to the base of the tree crosses the "0" mark on the ruler. This is line A in the diagram. Then move the ruler either towards or away from your eye until the line from your eye to the rope you tied to the tree crosses the "1" mark on the ruler. This is line B in the diagram. When the ruler is positioned correctly such that lines A and B point to the base and the known height, glance up and note the measurement where the line from your eye to the top of the tree (line C in the diagram) crosses the ruler. Do this without moving the ruler or your head. When you have this measurement, multiply it by the mathematically convenient height you selected in the beginning. This is the height of the tree.

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