sin(20) = 0.3420 (approx).
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20% = 72 degrees
I believe about 20 degrees.
The 3rd angle is 80 degrees
If the angle is x radians, then tan(x) = 1/20 = 0.05 So x = tan-1(0.05) = 0.04996 radians = 2.86 degrees (approx)
Trigonometry is really useful in life. If you want to be and engineer, architect, or builder, trig. is useful. If you say that a right triangle has an angle degree of 30 degrees, and the side opposite the angle is 10 ft, you can conclude that the hypotenuse is 20 ft. Trig. also states that any right triangle with a 45 degree angle has a ratio of .707106781184562. the ratio( sine) is 1 divided by the square root of 2, of the square root of 2 divided by to. Trust me, it's easier that it sounds