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# 9. Functions with two parameters

**bibleman13**#2

Well, lets take a look at this lesson based on the instructions. "Write a function called perimeterBox that returns the perimeter of a rectangle." "It should have two parameters."

"One formula for perimeter is length + length + width + width;" It has given us our variable (perimeterBox) , it is a function, the parameters of the function (length and width) it has given us the formula for perimeter to return the perimeter (length + length + width + width;). So now we build it:

`variable perimeterBox = function(length, width) {`

` return length + length + width + width; };`

Finally we need to call the function and pass any value in the parameters that we would like for length and width.

**system**#3

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