find tan(angle)

kalai · 发表于 2022-7-6 09:27:38

how to find tan of angle in lisp
my code

tanA= x/y
i know A and x
how to get y ?
help me.

MSasu · 发表于 2022-7-6 09:49:20

So, you know the angle and the oposite leg and look for adjacent leg?

(setq theY (/ theX (/ (sin theAngle) (cos theAngle))))

Regards,
Mircea

kalai · 发表于 2022-7-6 10:09:58

thanks,

i did try it. but if angle is greater than 90 then how to find y?

MSasu · 发表于 2022-7-6 10:20:50

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

MSasu · 发表于 2022-7-6 10:39:38

Or, if you know the size of triangle's third leg may use the cosine theorem.

Regards,
Mircea

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