Posted by anna on Monday, March 10, 2008 at 8:51pm.
The "grade" is the tangent of the slope angle.
arctan 0.07 = 4.00 degrees
(4 degrees is the angle whose tangent is 0.07)
how did u get the 4?
nevermind my calculator was being stupid. thanks
sorry one more question. so...
a road climbs at an 8 degree angle with the horizontal. what is the grade of the road?
the answer would be 5?
I used the arctan key of my hand calculator. If you don't have one, you should use a table of trig functions
The answer to your second question is the tangent of 8 degrees. That is 0.1405, for a 14.05% grade.
You don't find many roads that steep. Driveways, maybe.
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