acos() Math class method
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acos()
Description
Returns the arccosine of a number in radians.
- Radians to Degrees - divide number by (
Math.PI/ 180). - Degrees to Radians - multiply number by (
Math.PI* 180).
- Like all class methods
acos()should be used on the class rather than an instance of the class.
Syntax
| Signature | Description |
|---|---|
Math.acos(value) | Returns the arccosine of a number in radians. |
Parameters
| Parameter | Description |
|---|---|
value | The number you wish to find the arccosine in radians for:
|
Examples
The code below displays acos() usage.
// Store results in an array.
var acosValues = new Array(5);
acosValues[0] = Math.acos(-1);
acosValues[1] = Math.acos(0);
acosValues[2] = Math.acos(0.75);
acosValues[3] = Math.acos(-2);
acosValues[4] = Math.acos('a string');
acosValues[5] = Math.acos();
alert(acosValues);
Related Tutorials
JavaScript Advanced Tutorials - Lesson 4 - Math