Find Inverse Tangent?

Question

I'm new to Javascript and I'm trying to use inverse tangent to find the angle in degrees between a line and the x axis on an elevated y. I don't see any command for it so I really need some help.

Answer 1

Use Math.atan() function and then Math.toDegrees() multiply it by 180/Math.PI to convert radians to degrees Found the answer it here

Later edit:

Here is an example of angle calculation between a line defined by 2 points (A and B) and the X axis. The elevation of the second line (parallel with the X axis) is irrelevant since the angle stays the same.

 /*
 * Calculates the angle between AB and the X axis
 * A and B are points (ax,ay) and (bx,by)
 */
function getAngleDeg(ax,ay,bx,by) {
  var angleRad = Math.atan((ay-by)/(ax-bx));
  var angleDeg = angleRad * 180 / Math.PI;
  
  return(angleDeg);
}

console.log(getAngleDeg(0,1,0,0));

Answer 2

Try using Math.atan (outputs angle in radians) and some trigonometry.

Answer 3

Questions like these are best answered by the reference. I see a bunch of trigonometric functions there, including:

• acos()
• asin()
• atan()
• atan2()
• cos()
• degrees()
• radians()
• sin()
• tan()