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Math.atan() Method
This method returns an implementation-dependent approximation of the arctangent of the parameter. Syntax
Math.atan(number)
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number |
A numeric literal or numeric variable |
Returns
An implementation-dependent approximation of the arctangent of number, expressed in radians. Usage
The Math.atan() function returns an implementation-dependent approximation of the arctangent of the parameter. The return value is expressed in radians and ranges from -pi/2 to +pi/2. The function assumes number is the ratio of two sides of a right triangle: the side opposite the angle to find and the side adjacent to the angle. The function returns a value for the ratio. To convert radians to degrees, multiply by 180/Math.PI . Example
This example finds the roof angle necessary for a house with an attic ceiling of 8 feet (at the roof peak) and a 16-foot span from the outside wall to the center of the house. The Math.atan() function returns the angle in radians; it is multiplied by 180/PI to convert it to degrees. Compare the example in the discussion of Math.atan2() Method to understand how the two arctangent functions differ. Both examples return the same value. function RoofBtn_Click () { var height = 8; var span = 16; var angle = Math.atan(height/span)*(180/Math.PI);
TheApplication().RaiseErrorText("The angle is " + Clib.rsprintf("%5.2f", angle) + " degrees.") }
See Also
Math.acos() Method Math.asin() Method Math.atan2() Method Math.cos() Method Math.sin() Method Math.tan() Method
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