The Set Square should be placed against the lower edge of the T-Square, so the statement is true.
The T-square must be placed up against the edge of the drawing board. There must be no gaps otherwise the paper will not be set up correctly and drawing accurate horizontal and vertical lines will be impossible. The T-square must be placed up against the edge of the drawing board. There must be no gaps otherwise the paper will not be set up correctly and drawing accurate horizontal and vertical lines will be impossible.
With that being said, it is true that the set square should be placed against the lower edge of the T-square.
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