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Measure height and shadow af a smaller object --- call these h1 and s1 measure the shadow of something larger like a tree. call this s2 its height is the unknown call it h2 use a proportion to solve the problem h1/s1 = h2/s2 substitute in the measured amounts, rearrange the equation (proportion) and find the answer.
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They both share the same tangent ratio so let the height of the monument be x: 500/x = 40/36 Solving the above equation gives x a value of 450 which is the height in feet.
When the sun is low down, the shadow is longer. If the sun is high up the shadow is shorter.
Height of building/105 = 6/14 Multiply both sides by 105: Height = 630/14 Height = 45 feet