Water in the aquarium

You start to tilt a small cube aquarium to pour the water out. The picture shows the aquarium at the moment when the water starts pouring out. Calculate the volume of the water in the aquarium.[br][br]The size of the aquarium and its tilt can be changed (play with the points Tilt and Size). Make sure to know how to calculate the volume for various positions. Right click and drag to orbit the aquarium.

Information: Water in the aquarium