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Simple I messed it up in the calculation ....
Answer should be C

(3/4)*2r = 48 => r = 16*2 = 32
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The concept here is the relation between the length of the arc and the circumference
Formula is: Arc length=(arc degree/360)(circumference). In this case it translates to (270/360)(2PieR). Set this = to 48Pie and solve for Pie.
NB: Know the relationship between the Arc length and the Circumference/Area of the circle.
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