Obbliq:
Calculating PI (not very precise!)
Filling the semi-circle and the upper cells until the liquid don't boils.
Clearing the upper line of liquid blocks.
Pouring to the measurement container.
The amount of liquid must be: x = (1/2)* PI * 1.5^2
If the amount of liquid is x; PI= x * 2 / 1.5^2