New answers tagged substitute-tool
-1
With what I had at school (I made it up myself) I put a ruler on a glue stick directly in the middle so it stood up.
Then, put something small like a highlighter, a pen or even a ruler ext.
Put the centre of the object at 5cm;
If the glue stick still stands up, move the glue stick further away on the ruler until the point where it cannot go any further, ...
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