5/8 = tan(x) x = tan-1(5/8) = tan-1(0.625) = 0.558599 + k*pi radians or 32.00538 + k*180 degrees where k is an integer
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If its a right triangle, use SoH CaH Toah, or Sine = opposite over hypotenuse, Cosine = adjacent over hypotenuse, and tangent = opposite over the adjacent. So, to solve your problem, if "c" is the right angle, Tan(a) = bc/ca or Tan(30)=5/ca or .577 = 5/ca or (.577)*ca = 5 or ca=5/(.577) or ca= 8.66
tan(23) = 1.58815308
a equals 5
5/9=x/27 135=9x 15=x
1/5+1/11 = 11/55+5/55 = 16/55