In this role, the scissors there may be in those cases where it is necessary to mark out the surface measure equal segments. It is enough to fix the ends of the scissors between two wooden slats, holding their bolt or just firmly pulling any cord. In this position, the scissors can be a circularly-cut for plywood, cardboard, plastic.
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If you want to cut the pipe lengthwise into halves, it is necessary to outline its diametrical plane. It's easy to do and without any measuring devices by using a sheet of paper....
