Ends are semicircular, so radius equals half the pad width.
They don't dimension pads because those are up to the designer, PCB fab, and assembler to determine.
Typically an annular ring (pad radius minus hole radius) of 5 mil minimum is required, plus about half the hole radius. So a 20 mil dia. hole gets 5 + (10 / 2) = 10 annulus, or 40 mil dia. pad.
Tim