Along the edge.
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the answer would be 10 0n apex
A WOOD RULER A STONE RULER A IRON RULER A DIAMOND RULER A EMERALD RULER
On a 30cm ruler you can't get it exactly, you need a higher tech ruler which has the markings of 2.54cm. If you have a normal ruler you have to estimate.
The answer will depend on how long the ruler is!
inch ruler