You wll also need to know its radius as well as its volume
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Calculating the radius of dish end size from the pressure vessel diameter is easy. All you have to do is add the blank radius by scaling the drawing from the side and you add five percent.
You simply calculate it like a cone, but the height of the cone is the height to the top of the FILLED part, not all the way. Half-filled is not enough information . . . there can be "half filled" meaning half the height of the cone, but can also be "half filled" meaning half the volume of the cone.
Depends on the shape of the vessel. Different shape, different formula.
Throw them all into a suitably sized measuring vessel marked with volumes and measure the amount of water they displace.
Fill the 5l vessel. Pour 3l into the 3l vessel. Empty the 3l vessel on the ground. Pour the remainder (2l) into the 3l vessel. Fill the 5l again, and pour as much as you can (1l) into the 3l vessel. There are now 4 liters in the 5 liter vessel.