I need to calculate an angle of a triangle by using the tan^-1 function. On my calculator I can do this:

tan^-1(3/4) // 3 and 4 are triangle side lengths

And it outputs 36 degrees. What is the alternative to this function in JavaScript? I tried Math.tan(3/4), Math.atan(3/4) and all of the other tan functions I saw in the list, but none of them outputs the result in degrees I need (36). Thank you.

I need to calculate an angle of a triangle by using the tan^-1 function. On my calculator I can do this:

tan^-1(3/4) // 3 and 4 are triangle side lengths

And it outputs 36 degrees. What is the alternative to this function in JavaScript? I tried Math.tan(3/4), Math.atan(3/4) and all of the other tan functions I saw in the list, but none of them outputs the result in degrees I need (36). Thank you.

• javascript

Share Improve this question Follow edited Sep 29, 2015 at 12:20 Wolf 10.3k88 gold badges6868 silver badges112112 bronze badges asked Sep 29, 2015 at 11:50 AskermanAskerman 84711 gold badge1414 silver badges3131 bronze badges 2

• 2 javascript works in radians – Jaromanda X Commented Sep 29, 2015 at 11:51
• By the way it should be 36.8698976, not 36. Math.atan(3/4) * 180 / Math.PI – Jaromanda X Commented Sep 29, 2015 at 11:54

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There is no build in function for that, since 1 radian = 180/pi degrees you can do the following using Math.atan() and Math.PI

var degree = Math.atan(3 / 4) * (180 / Math.PI);

document.write(degree);