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It depends on the type of ruler you are using. Depends if you are using a just metric unit ruler or if you are using a yard/meter stick. The measurements should be written along the edge of the ruler.
Make sure you are using the correct SI unit on the ruler.
a ruler using centimetres as the mesurement
You cannot. You cannot ensure the lines are strictly parallel using only a ruler.
There is a hole in the ruler (i.e.) circle just make the circle using that