If the diameter of the circle above is 16 mm, what is the area of the circle? 256 mm2 16 mm2 8 mm2 64 mm2

Area=πr² where r=d/2
                       r=8mm
Area=πx8x8
      =64π mm² 
I think you omitted the π symbol in your choices so the answer is not in there but should be 64π mm²

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