Length of an arc between two angles

From Rosetta Code

Task

Calculate the length of the arc (green) between two angles;


https://imgur.com/a/aYgDLxr

It is important in video game programming

implement a method that takes parameters like:

  • xpos of the circle
  • ypos of the circle
  • radius
  • ang1
  • ang2

return green arc_lenght

example method:

arc_lenght (xpos, ypos, radius, ang1, ang2) { return arc_lenght; }

Julia

The task seems to be to find the distance along the circumference of the circle which is NOT swept out between the two angles. <lang julia> arclength(r, angle1, angle2) = (360 - abs(angle2 - angle1)) * π/180 * r @show arclength(10, 10, 120) # --> arclength(10, 10, 120) = 43.63323129985823 </lang>

Phix

Translation of: Julia

<lang Phix>function arclength(atom r, angle1, angle2) 

   return (360 - abs(angle2 - angle1)) * PI/180 * r

end function ?arclength(10, 10, 120) -- 43.6332313</lang>

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