Asked by anna
                The grade of a road is 7%. What angle does the road make with the horizontal?
I'm confused!! What is the grade of a road? Thanks for the help!
            
        I'm confused!! What is the grade of a road? Thanks for the help!
Answers
                    Answered by
            drwls
            
    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)
    
arctan 0.07 = 4.00 degrees
(4 degrees is the angle whose tangent is 0.07)
                    Answered by
            anna
            
    how did u get the 4?
    
                    Answered by
            anna
            
    nevermind my calculator was being stupid. thanks
    
                    Answered by
            drwls
            
    I used the arctan key of my hand calculator. If you don't have one, you should use a table of trig functions
    
                    Answered by
            anna
            
    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?
    
a road climbs at an 8 degree angle with the horizontal. what is the grade of the road?
the answer would be 5?
                    Answered by
            drwls
            
    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.
    
You don't find many roads that steep. Driveways, maybe.
                    Answered by
            fatass
            
    yummy cheesburger
    
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