Bookshelf v7.7: Math.cos() Method

This method returns an implementation-dependent approximation of the cosine of the parameter. The parameter is expressed in radians.

Math.cos(number)


Parameter	Description
number	A numeric literal or numeric variable representing an angle in radians

An implementation-dependent approximation of the cosine of number.

The return value is between -1 and 1. NaN is returned if number cannot be converted to a number.

The angle can be either positive or negative. To convert degrees to radians, multiply by Math.PI/180.

This example finds the length of a roof, given its pitch and the distance of the house from its center to the outside wall.

function RoofBtn3_Click ()
{
   var pitch;
   var width;
   var roof;

   pitch = 35;
   pitch = Math.cos(pitch*(Math.PI/180));
   width = 75;
   width = width / 2;
   roof = width/pitch;

TheApplication().RaiseErrorText("The length of the roof is " +
Clib.rsprintf("%5.2f", roof) + " feet.");
}