Descent of road

Road sign informs the gradient is 10.9%. Calculate the angle which average decreases.

Correct answer:

x =  6.2 °

Step-by-step explanation:

q=10.9%=10.9100=0.109  tanα=y:x=q  α=arctan(q)=arctan(0.109)0.1086 rad  x=α  °=α 180π   °=0.1086 180π   °=6.2  °=6.2°=6°1314"



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