JavaScript atan() and atan2() Methods
 Complete Math Object Reference
Definition and Usage
The atan() method returns the arctangent of a number as a numeric
value between -PI/2 and PI/2 radians.
The atan2() method returns the angle theta of an (x,y) point as a numeric
value between -PI and PI radians.
Syntax
Math.atan(x)
Math.atan2(x,y)
|
| Parameter |
Description |
| x |
Required. A number |
| y |
Required. A number |
Example 1 - atan()
The following example returns the arctangent of different numbers with
the atan() method:
<script type="text/javascript">
document.write(Math.atan(0.50) + "<br />");
document.write(Math.atan(-0.50) + "<br />");
document.write(Math.atan(5) + "<br />");
document.write(Math.atan(10) + "<br />");
document.write(Math.atan(-5) + "<br />");
document.write(Math.atan(-10));
</script>
|
The output of the code above will be:
0.4636476090008061
-0.4636476090008061
1.373400766945016
1.4711276743037347
-1.373400766945016
-1.4711276743037347
|
Example 2 - atan2()
The following example returns the angle theta of different (x,y) points with
the atan2() method:
<script type="text/javascript">
document.write(Math.atan2(0.50,0.50) + "<br />");
document.write(Math.atan2(-0.50,-0.50) + "<br />");
document.write(Math.atan2(5,5) + "<br />");
document.write(Math.atan2(10,20) + "<br />");
document.write(Math.atan2(-5,-5) + "<br />");
document.write(Math.atan2(-10,10));
</script>
|
The output of the code above will be:
0.7853981633974483
-2.356194490192345
0.7853981633974483
0.4636476090008061
-2.356194490192345
-0.7853981633974483
|
Try-It-Yourself Demos
atan()
How to use atan() to return the arctangent of different numbers.
atan2()
How to use atan2() to return the angle theta of different (x,y) points.
Complete Math Object Reference
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