1 ft by 1.2 ft... verticaly 1.2ft
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If the scale is 1 to 16, then each dimension in the real world is 16 times its size on the drawing, and its size on the drawing is 1/16 of its real size. The barn must be drawn 2-ft high on the plans.
It depends on the species of wood the joists are made from but it should be in the low 11 to mid 12 foot range. Note that the span is the distance between the inside edges of the end supports, so a 12' joist on 2x4 walls will actually span only 11'5" (12 - 3.5 -3.5)
Length of arc, with angle x is pi*r*x/180 (where r is the radius) = pi*16*20/180 = 5.59 inches.
If you need 75% to past a test of 16 questions, you need to get at least 12 or more right...
one that is 16in in diameter.