Conventionally the shorter measure is the width, so the 6 ft would be taken to be the width.
However, it does not have to be, for example the width of a window is the distance from side to side regardless of the height of the window - with a short but wide window the width would be the longer measurement.
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(width + 6) feet, of course!
Width = 16 feet Length = 38 feet
6 feet (5 + 5 + 6 + 6 = 22)
You have provided the length and width of the boards but only the width (height) of whatever you wish to board. there is no information on its length and consequently, the question cannot be answered.
length times width