1955 AHSME Problems/Problem 36
Problem 36
A cylindrical oil tank, lying horizontally, has an interior length of 
feet and an interior diameter of 
feet.
If the rectangular surface of the oil has an area of 
square feet, the depth of the oil is:
Solution (takes advantage of answer choices)
In order to complete the rectangle area of the oil tank, the chord on the circle must have a length of 
. Since it's not the diameter , there are two possible outcomes. The only choice that reflects this is 
.
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