The error in Amie's evaluation as described in the task content is; Amie should have multiplied 54 by Two-thirds.
Since it follows that the she needs the volume of the sphere in which case the radius of the sphere is half the height.
Hence we have;
V(sphere) = (4/3) πr² × h/2
V = (2/3) × πr²h
Where πr²h = Volume of the cylinder = 54cm
Hence, Amie should have multiplied 54 by Two-thirds.
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