Tutorial # 11. Plato's Meno. Meno's Paradox - Meno's Slave

Plato: The Area of this square is 8 units, right?
Slave: Yes
Plato: So the number we are after is the length of the red line, right?
Slave: Yes
Plato: What is that length then ?
Slave: I do not know

From Plato Meno, 79e-86c.