Determine third point of triangle when two points and all sides are known

Determine third point of triangle when two points and all sides are known.js

//a,b,c are the sides of the triangle

function get_third_point_coordinates(a, b, c){
  var result = {x:0,y:0};

  if(a > 0){
    result.x = (c*c - b*b + a*a) / (2*a);
  }

  result.y = Math.sqrt(c*c - result.x*result.x);
  return result;
}

var coordinates = get_third_point_coordinates(21, 17, 10);
document.write(JSON.stringify(coordinates))

and what are the other two points?

Point 1 is {x:0, y:0}.
Point 2 is {x:0.001, y:a}.
The distance between point 1 and point 2 is a.
The distance between point 2 and point 3 is b.
The distance between point 1 and point 3 is c.

get_third_point_coordinates(a,b,c) gives the coordinates of Point 3.

so basically, this is for right triangles only?

No, it's for any triangle