Find angle between 2 points using 2d coordinates.

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velu - 22 May 2006 11:47 GMT

Find angle between 2 points using 2d coordinates.

I am trying to write a tool to find angle between 2 coordinates in 2d space.

I know the distance of adjacent side and hypotenuse.

Cos(angle) = adjacent side / hypotenuse

Angle = (adjacent side / hypotenuse) inverse of Cos

I exactly don’t know where to find and use the inverse function in vb.net

Your help much appreciated..

Thx
JK

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FUnky - 22 May 2006 12:29 GMT

Use System.Math.Acos(xxx)

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velu - 22 May 2006 12:53 GMT

thx for respoding fast but i get a wrong Answer.

say for example lets take a erual triagnel of sides each 6 units. so
Cos(xxx) = Adj / Hyp
ie

Cos(Angle) = 3 / 6
Cos(Angle)= 0.5
(Angle) = o.5 invers of Cos
(Angle) = 60Deg

but i use the as per your thoughs

if i use

System.Math.Acos(xxx) ie System.Math.Acos(0/5) i get 1.047198

i am in chaos...help me..

-JK

> Use System.Math.Acos(xxx)

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Marc Gravell - 22 May 2006 13:17 GMT

60 degrees = 1.04719755 [etc] radians

Same answer, but a lot of math on trigonometry is expressed in radians;

to get back to 60, divide by Pi and multiply by 180 (or look for an existing
conversion function)

Marc

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Find angle between 2 points using 2d coordinates.

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