If two chords AB and CD intersect externally at P, then PC x PD = _____.
PA
PA + PB
PA - PB
PA x PB
If two chords AB and CD intersect internally at P and if PA = 5, PB = 4, PD = 2, then PC =
If two chords AB and CD intersect externally at P and if AB = 4, PB = 5, PD = 3, then CD =