  In this paper, we analyze the two geometrical passages in Plato's Meno, (81c
-- 85c) and (86e4 -- 87b2), from the points of view of a geometer in Plato's
time and today. We give, in our opinion, a complete explanation of the
difficult second geometrical passage. Our explanation solves an ingenious
geometry puzzle that has baffled readers of Plato's Meno for over 2,400 years.
