For the area shown in the figure below, OAC is the area of a sector with center at C and radius OC=AC=4*sqrt(2)~5.657 units. This is part 1. Part 2 is the triangle COD. Part 3 is the triangle CAB....

For the area shown in the figure below, OAC is the area of a sector with center at C and radius OC=AC=4*sqrt(2)~5.657 units. This is part 1. Part 2 is the triangle COD. Part 3 is the triangle CAB.  Determine the radius of gyration of area of composite OABCD about the y-axis [units^4].