[list][br][*]For [b]DISK AROUND X-AXIS[/b] set g(x)=0 and k=0[br][/*][*]For [b]WASHER AROUND X-AXIS[/b] set k=0[br][/*][*]"rev" slider sets angle of revolution of region around axis[br][/*][*]"Trans" slider sets transparency invisible, translucent, opaque[br][/*][*]"Washer" sets visibility of washer or disk[br][/*][*]"Washer/Disk Pos'n" slides washer or disk along axis inside of solid[br][/*][*]"Show Only Solid" hides everything except solid and axis[br][/*][*]"Revolve" animates revolution of region around axis (kinda laggy)[br][/*][*]"Spin It!" spins solid around y-axis[br][/*][*]"Stop" stops revolution of region or spinning[br][/*][*]"Reset View" centers view over x-y plane at axis[br][/*][*]Click and drag 3D view to manually adjust[/*][*]"Projection Type" button (4th) in 3D view to select 3D glasses[/*][*]"Show or Hide Grid" button (2nd) in 3D view[/*][/list]