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15/100
15 __ 100
rise/run = tangent 15 degrees rise = tan(15) x 48 = 12.86 inches
It is 6/15.
For tan(180 degrees), this is simply sin(180 degrees)/cos(180 degrees). To find these values, note that 180 degrees is the leftmost point on the unit circle, at y=0, x=-1, so is tan(180 degrees)=0/-1=0. Then adding 15 gives 15.