Task
Write two function for the following instructions:

getArea(length, width)
: Calculate and return the area of a rectangle having sides length and width. 
getPerimeter(length, width)
: Calculate and return the perimeter of a rectangle having sides length and width.
The values returned by these functions are printed to stdout by locked stub code in the editor.
Constraints
 1 ≤ length, width ≤ 1000
 length and width are scaled to at most three decimal places.
Input Format
getArea(length, width)
:
Data Type  Parameter  Description 

Number 
length  A number denoting the length of rectangle. 
Number 
width  A number denoting the width of rectangle. 
getPerimeter(length, width)
:
Data Type  Parameter  Description 

Number 
length  A number denoting the length of rectangle. 
Number 
width  A number denoting the width of rectangle. 
Output Format
Function  Return Type  Description 

getArea(length, width) 
Number 
The area of a rectangle having sides length and width. 
getPerimeter(length, width) 
Number 
The perimeter of a rectangle having sides length and width. 
Sample
Input
3
4.5
Output
13.5
15
Explanation
 The area of the rectangle is length x width = 3 x 4.5 = 13.5.
 The perimeter of the rectangle is 2 x (length + width) = 2 x (3 + 4.5) = 15.
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