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When we are in learning will encounter
many problems, such as a ruler fell to the
ground, we may find it difficult to pick it up,
thus bring inconvenience to the study.
Set square use it’s structure, make the
middle triangular structure, in contrast to
the outside of slope, even if fall to the
ground, each side will create a gap with
the ground, straight edge on the edge of
the other, do a diagonal plane, as shown,
is solved by the analysis of the problem.