Converting Degrees to Radians

You will now create a function to prevent you from repetitively typing an equation. It looks like this:

(defun Degrees->Radians (numberOfDegrees)

(* pi (/ numberOfDegrees 180.0)))

*Degrees->Radians*. The function
name indicates its purpose.

^{.} uses radian angular measurement to keep track
of angles, whereas most people think in terms of degrees. This
function in your toolkit allows you to think in degrees, and lets
AutoLISP^{.} convert those numbers to radians.

- Enter the following at the VLISP Console prompt:
(defun Degrees->Radians (numberOfDegrees)

(* pi (/ numberOfDegrees 180.0)))

- Enter the following at the VLISP Console prompt:
(degrees->radians 180)

The function returns the number 3.14159. According to how this function works, 180 degrees is equivalent to 3.14159 radians.

*gpmain.lsp*
file. You can paste it anywhere in the file, as long as you do not
paste it into the middle of an existing function.

To clean up your work, select the text you just pasted in, then choose the Format Selection button; VLISP will properly indent and format the code.

Next, add some comments describing the function. When you have fully documented the function, your code should look something like this:

;;;--------------------------------------------------------------;

;;; Function: Degrees->Radians ;

;;;--------------------------------------------------------------;

;;; Description: This function converts a number representing an ;

;;; angular measurement in degrees, into its radian ;

;;; equivalent. There is no error checking on the ;

;;; numberOfDegrees parameter -- it is always ;

;;; expected to be a valid number. ;

;;;--------------------------------------------------------------;

(defun Degrees->Radians (numberOfDegrees)

(* pi (/ numberOfDegrees 180.0))

)