CODEWITHSUNDEEP
c#angle
Marek Buchtela
Marek Buchtela

Reputation: 1003

How to get an angle using tangent

I have a triangle, knowing lenghts of two sides (see picture) and need to know an angle shown in the picture (red are known, the blue angle is what I need to count)

enter image description here

I found out, that Math.Tan gets me the angle expressed in radians, so when I tried to do this: 

alpha = Math.Tan((CA/AB));

I always get 0 as a result. My question is - how can i get this angle, knowing only these two sides?

Upvotes: 1

Views: 6250

Answers (3)

Gökhan Çoban
Gökhan Çoban

Reputation: 610

The angle that you are looking for is arctanjant not tanjant.

So you should use the arctanjant function of .Net library. The following line gives what you need.

double alpha = Math.Atan ((double)CA/AB) * 180 / PI;

where PI is 3.14 as you know.

Upvotes: 2

RMalke
RMalke

Reputation: 4094

Try:

double alpha = Math.Atan2(CA, AB)

Make sure the result, alpha, and other variable are double

Upvotes: 6

Servy
Servy

Reputation: 203820

My psychic debugging tells me that CA and AB are both integers, either int or long. The result will therefore also be an integer type, truncating any decimal value as needed. Convert at least one of the values to a floating point type to get a floating point result:

alpha = Math.Tan((CA/(double)AB));

Upvotes: 4

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