leading edge of the land with a plane having the axis of the drill
flank and a plane at right angles to the drill axis
chisel edge and the lip as viewed from the end of a drill
none of the above
helix or rake angle
point angle
chisel edge angle
lip clearance angle
helix angle
zero helix angle is used
low helix angle is used
high helix angle is used
any helix angle can be used