kalai Posted May 20, 2011 Posted May 20, 2011 how to find tan of angle in lisp my code tanA= x/y i know A and x how to get y ? help me. Quote
MSasu Posted May 20, 2011 Posted May 20, 2011 So, you know the angle and the oposite leg and look for adjacent leg? (setq theY (/ theX (/ (sin theAngle) (cos theAngle)))) Regards, Mircea Quote
kalai Posted May 20, 2011 Author Posted May 20, 2011 thanks, i did try it. but if angle is greater than 90 then how to find y? Quote
MSasu Posted May 20, 2011 Posted May 20, 2011 The above trigonometric formula works only in right-angled triangles - for your case need to split your current triangle in right-angled triangles and perform calculations in each to get the appropriate formula. Can you post a sketch of your case? Regards, Mircea Quote
MSasu Posted May 20, 2011 Posted May 20, 2011 Or, if you know the size of triangle's third leg may use the cosine theorem. Regards, Mircea Quote
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