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When a pencil is rubbed on paper fiction causes a small amount of the graphite from the core of the pencil to be left on the paper. This leaves a visible mark.
Trace the figure. Then turn the tracing paper over so that the pencil marks are on the opposite side of the paper. If you can find a position in which the original figure and the inverted trace match up, you have a line of symmetry.
the function of a pencil is to write with out getting your hands dirty and to be able to write on paper instead of stone.
You start with a pen/pencil and some paper.
It means to use pencils and paper, rather than computers, or calculators.