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It is not a proportion. There needs to be aroubd a 75 degree angle from the ground to the base. If it is too flat the ladder can slip out from underneath you. If it is too steep you can tip back. There is usually an angle at the bottom of the ladder if that is flat on the ground then that should be the safest angle (75 degrees)
slip gauges are the end standard devices used to measure length. angle slipgauges are used to measure angles . both of them can wring with each other .. and evrything is same : )
near the bottom.because the net force is equal to zero
Effective diameter = Barrel Diameter - (Average pass height + Roll Gap) Average pass height = Area/pass width
roll no slip