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It is 10^(-0.123) = 0.7534, approx.
There isn't one because that woud be dividing by zero which does not exist.
if the slope is 1 in 22, draw horizontal line 22 long, then vertical line 1 high, hypotonuse is slope, angle of slope is (INV tan ( 1 / 22)) . same deal for 1 in 66, 66 along then 1 up, angle is (INV tan ( 1 / 66))
On a grade stake, "INV" typically stands for "Inverted," indicating that the stake is positioned upside down. This marking can signify that the reference point or elevation is measured from a different orientation, often for specific construction or surveying purposes. It helps workers understand how to interpret the measurements accurately based on the stake's orientation.
22 % grade: go horizontally 100, go vertically 22, hypotonuse is slope. angle is INV tan ( 22 / 100 ) = 12.407 degrees from horizontal