None that I can see.
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Only half of the circle would be shaded.
Equivalent to what? No fraction is "equivalent" by itself; you can say that two or more fractions are equivalent, if they represent the same number.
It represents 0.5 which is equivalent to 1/2 = a half
50%
The answer will depend on a half's what! A half's square and a half's cube will be equivalent to different numbers.