You should ask your relatives how tall they were when they were your age and how tall they were when they were older than you.
See related link below for height calculator
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21cm and 16cm.what is the difference in height?
To calculate volume simply do length x width x height
Messure it,
The height and longer diagonal do not provide enough information to calculate the sides.
If you cannot estimate the height then, unless it is a very specific shape, you cannot calculate the volume.