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Let the length of the shadow be x and use the tangent ratio:

5/1.2 = 17/x

Make x the subject of the equation:

x = (17*1.2)/5

x = 4.08 feet

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Q: At any given time of the day the ratio of an object the length of its shadow is the same for all objects if a 5ft post casts a shadow of a 1.2ft find the length for a 17ft post?
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