How to read 1:10
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Does this 1 refer to the width of the shorter side or the unshown portion?
It must be the shorter side, that is, the vertical leg; the length of the longest hypotenuse is greater than 10.
Personal understanding 1: 10 should be the ratio of the two perpendicular sides
The answer above is correct; the so-called 1:10 actually refers to the tangent function.
The slope of the inclined edge of the channel steel is given for the larger end dimension, while the dimension of the smaller end is determined based on W.
The drawing is the standard diagram for LPEC ladder platforms