MeshCells[voronoidata, 2]
{Polygon[{11, 6, 10, 2}], Polygon[{18, 4, 13, 22}], Polygon[{16, 9,
17, 20, 21}], Polygon[{1, 3, 7, 2, 10}], Polygon[{5, 1, 10, 6, 8}],
Polygon[{15, 11, 2, 7, 14}], Polygon[{13, 4, 5, 8, 12}],
Polygon[{14, 7, 3, 9, 16}], Polygon[{19, 12, 8, 6, 11, 15}],
Polygon[{17, 9, 3, 1, 5, 4, 18}]}
