Get angle Two lines svg react js

Question

Hellow it possible get angle two lines in react js, using svg, without using the svg set attribute?

already tried several tutorials of the stack but none really returned the angle between the two lines and yes only the angle in which the line is, I tried this.

findAngle(p0,p1,p2) {
  var a = Math.pow(10,2) + Math.pow(100,2),
      b = Math.pow(10,2) + Math.pow(10,2),
      c = Math.pow(10,2) + Math.pow(70,2);
  var aa = Math.acos( (a+b-c) / Math.sqrt(4*a*b) );

  console.log(aa);

}

obs: these values are in my two lines.

Answer 1

Based on this answer, you want something like this:

// helper function: make a point
function point(x,y){
   return {'x':x,'y':y};
}

// helper function: get distance between points a and b (by Pythagoras)
function d(a,b) {
   return Math.sqrt(d2(a,b));
}

// helper function: get square of distance between points a and b
function d2(a,b) {
   return (a.x-b.x)*(a.x-b.x) + (a.y-b.y)*(a.y-b.y);
}

// helper function: convert radians to degrees
function rad2deg(angleInRadians) {
   return angleInRadians/(Math.PI/180);
}

// get the angle in degrees between ab and ac, using the cosine rule:
function angle_deg(a,b,c) {
   return rad2deg(Math.acos((d2(a,b) + d2(a,c) - d2(c,b)) / (2 * d(a,b) * d(a,c))));
}

p0 = point(0,0);
p1 = point(1,0);
p2 = point(0,1);

console.log(angle_deg(p0,p1,p2)); // 90