JavaScript: Find the angle between two points

angle-between-points.js

// FInd Angle between 2 point ... 0 to 90
var p1 = {
	x: 20,
	y: 20
};

var p2 = {
	x: 40,
	y: 40
};

// angle in radians
var angleRadians = Math.atan2(p2.y - p1.y, p2.x - p1.x);

// angle in degrees
var angleDeg = Math.atan2(p2.y - p1.y, p2.x - p1.x) * 180 / Math.PI;



// FInd Angle between two points 0 to 360

const angle = (anchor, point) => Math.atan2(anchor.y - point.y, anchor.x - point.x) * 180 / Math.PI + 180;

const a = {
	x: 20,
	y: 20
};

const p = {
	x: 0,
	y: 0
};

angle(a, p); // 225

// angle in degrees, from example, same data
angleDeg = Math.atan2(a.y - p.y, a.x - p.x) * 180 / Math.PI; // 45