A single slash perpendicular to the line is used to show it is congruent. In other words, if two segments are congruent they would both have a single slash through them, but if you have multiple pairs, each separate pair would have its own unique number of slashes (1,2,3...).
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The following is a simple way to divided any triangle into n^2 congruent triangles (n > 1):Divide each side of the triangle into n equal parts,Select a pair of lines and join pairs of the above division marks with lines which will be parallel to the third side.Repeat step 2 with the other two pair of lines.
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.
In a triangle, if two sides show to be congruent, you would use the reflexive property of congruence. (AB=AC) A /\ / \ / \ B C As shown in this diagram AB and AC obviously show to be parallel(as shown by the slash marks...