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# A Triangle Math Formula

Posted on 1998-01-31
Medium Priority
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This has little to do with VB other than the program I am writing is written in VB. It is really about math but I didn't know where else to ask.

I have a triangle

a
|\
|_\c
b

I always know the length of the three sides.
Angle b is always 90 degrees.

What the heck is the formula to find the angle of a or c?

I know that the two angles add up to 90 degrees but can't remember my highschool math well enough to remember how to figure this out. Too many years without using it I guess.
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Question by:schworak
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ID: 1454676
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dirtdart earned 120 total points
ID: 1454679
In your drawing above, side I will refer to side ab and side ac, referring to the sides running between the angles.

angle a = Atn(cb/ab)
angle c = Atn(ab/cb)
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Expert Comment

ID: 1454680
hmmm...

That returns radians dirtdart, schworak is working in degrees.

schworak, the formula for degrees is dirtdarts formula with an added conversion:

angle a = Atn(cb/ab)  * (180 / 3.14159265359)
angle c = Atn(ab/cb)  * (180 / 3.14159265359)

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ID: 1454681
That works great. Thanks. RADIANS and DEGREES are easily converted between each other.
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