Answer :

Answer:

Step-by-step explanation:

Find a point on the line ....say    9, 3

   that is a horizontal distance of 9   and a vertical distance of 3

    these distances are the legs of a RIGHT triangle

       for RIGHT triangles   Tan Θ = opposite leg/ adjacent leg

        so    tan Θ = 3/9

       then   Θ = arctan (3/9) = 18 degrees  (rounded)