The dimensions given fits that of a right angle triangle and sin^-1(12/13) = 67.38 degrees
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sin = -12/13 cos = 5/12 tan = -5/12 cosec = -13/12 sec = 12/5 cotan = -12/5
It is: cos^-1(12/13) = 22.61986495 degrees
Cos(angle) = adjacent / hypotenuse. Cos(a) = a/h Substitute Cos(X) = 5/13 = 0.384615... A = Cos^*-1( 0.384615 .... A = 67.38013505... degrees.
No because otherwise it would be a right angle triangle.
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