If B is the center of the circle in the figure above and the area of the shaded region is 16π, what is the length of arc ADC? Choose the correct choice:  A) 4  B) 4π  C) 16  D) 8π  E) 16
Area of 1/4th of the circle is 16pi   so area of the circle=64 pi   radius of circle=8 units   circumference= 2 pi* radius= 16 pi   1/4th the circumference= required length of ADC= 4pi   ANS:4π
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If B is the center of the circle in the figure above and the area of the shaded region is 16π, what is the length of arc ADC?