# Thread: Finding the Arcsine of X

1. ## Finding the Arcsine of X

Is it just me? How on earth do you find the Arcsine of a number to come up with an angle?

On a graph I have a length X, length Y and their hypotenuse Z. I now need to find the angle produced opposite of the Y value. It's easy right?

Yangle = Arcsine(Y/Z)

...but how do I do this in VBA!!?? They give you the Sin, Cos, and Tan functions and even the Atn (arctangent) function but I can't find the Arcsine function. Can anyone tell me how to find this angle? Thanks for any help on this.

2. ## Re: Finding the Arcsine of X

Try this:

ArcSin(x) = Atn(x / Sqr(-x * x + 1))

-Buzz

3. ## Re: Finding the Arcsine of X

I had the same problem a few years ago. I don't believe I found anything for Arcsine but ATAN is a function. I think I used it and worked backwards.

4. ## Re: Finding the Arcsine of X

Yeah... duh.. I guess I should have realized that I could have just plugged in the X and Y values in a different way to utilize Arctan instead of using Arcsine. Thanks for the quick responses. I wonder why "they" chose to leave out the other two functions?

5. ## Re: Finding the Arcsine of X

You can use "atan,asin,acos"
enoy it

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