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There are an infinite number of answers to this question. To demonstrate, let us write it as a function (where urepresents the unit of measurement):

a * b * 1/2 = 30u2
a = 60u2 / b
Now you can plug any b value into that function, and get a value for a that meets the conditions of the question. For example, if b = 20cm then a = 60(cm2) / 20cm, which equals three centimeters; If b = 3.2Lbs, then a = 18.75Lbs; if b = 120 parsecs, then a = 0.5 parsecs.

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12y ago

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