python math problem

Bob Brusa bob.brusa at gmail.com
Fri Feb 15 20:57:27 CET 2013


Am 15.02.2013 20:39, schrieb Kene Meniru:
> I am trying to calculate the coordinates at the end of a line. The length
> and angle of the line are given and I am using the following formula:
>
> x = (math.sin(math.radians(angle)) * length)
> y = (math.cos(math.radians(angle)) * length)
>
> The following are sample answers in the format (x, y) to the given
> length/angle values of the line:
>
> 120/0  = (0.0, 25.0)
> 120/89 = (24.9961923789, 0.436310160932)
> 120/90 = (25.0, 1.53075794228e-15)
> 120/91 = (24.9961923789, -0.436310160932)
>
> Why am I getting a string number instead of the expected answer  for 120/90
> which should be (25.0, 0.0). This happens at all multiples of 90 (i.e. 180
> and 270)
>
Kene,
are you sure your length is 120? It seems to be 25. I did these 
calculations with length = 25 and then your numbers make perfect sense.
Bob



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