According to the diagrams below, how long is each unknown piece?
28 mm
11 mm
?

The length of the second piece is 17mm
In the diagram given, the total length of the diagram is given as 28mm.
The length of the first piece is given as 11mm, then in order to get the second piece, we would subtract 11mm from 28mm and this will be:
= 28mm - 11mm
= 17mm
In conclusion, the length of the second piece is 17mm
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