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JavaScript: Find the angle between two points
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;
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