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*Note: Perimeter is the distance "all away around"
For a rectangle, the Perimeter would be the SUM of lengths of ALL four sides
often stated as: P = 2*l + 2*w
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Rectangle with top and bottom having length (n+10) and the sides each being n
P = (n+10)+ (n+10) + n + n = 4n + 20
or can be written
P = 2(n+10) + 2n = 4n + 20
*Note Area of a Rectangle is l*w
Rectangle with top and bottom lengths of (n+10) and is n units wide
A = (n+10)*n