We are assuming the 6 pieces are equal.
Let the radius be R=5 in.
The circumference of the pie is given by C=2πR=2π*5 (in) = 10π (in)
The pie is cut into 6 pieces means that the circumference is also divided into 6 arcs of equal length = 10π/6 (in)= 5π/3 (in)
Answer: D- 5pie / 3