Divide the length of the tree’s shadow by the length of the person, measuring stick or pole’s shadow and then multiply it by the height of the person, measuring stick or pole – the answer is the height of the tree. Measure the length of the shadow of something of a known height (for example a person, a measuring stick or a pole). On a sunny day, measure the length of a tree’s shadow. This creates a triangle where the base and the height are about equal – so the distance from the tree is about the same as the height of the tree. This works because an adult bending over and looking up at the top of the tree creates about a 45 degree angle. The distance they are from the tree is roughly the same as the height of the tree. Get an adult to walk away from a tree until they are just about able to see the top of the tree when they bend over and look through their legs. These examples are all about trees, but would work for buildings, telegraph poles and any other tall structures. Try the different methods for the same tree and see how similar (or different) the results are. The most accurate way to measure something is using a tape measure, but some things are too tall (or too scary) to climb with a ruler.
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