Area total area Function

Hello guys, Matlab rookie here

How can I make a function with 2 variables that will give me total area.

I am aware, there is no need for this function when I can get my answer by using simply Totalweight=dot(Area,Lenght); , reason I want it to work as a function is I am writing a ga(genetic algorithm) function and this will be my Objective function.

this is what I got so far:

function Totalweight(Area,Lenght)

Lenght=[110 110 110 110 110 155 155 110 155 155]; Area=[110 110 110 110 110 155 155 110 155 155];

Totalweight=dot(Area,Lenght); end