Inlet:

1. antero posterior: 11cm
2. oblique: 12cm

Cavity:

1. antero posterior: 12cm
2. Transverse:. 12cm

Outlet:

(a). Obstetrical outlet

1. antero posterior:. 11cm
2. Transverse:. 10.5cm

(b). anatomical outlet

1. antero posterior: 13cm
2. Transverse:. 11cm