Calculate total length of perimeter

Hey guys, I am quite new to MATLAB (2 weeks in) and have never coded before.

I have a task to produce a script that uses an nx2 array of coordinates, say x and y that correspond to the corners that form a boundary of a shape.

I want to code this so it calculates the total length of perimeter distance no matter what the input in the array is, for example a square could be:

 Square = 
 00
 30
 33
 03

So the perimeter would be 12, displayed to the user at the end. The last coordinate is the last corner before returning to the start. I can't use any built-in function that calculates co-ordinate distances or perimeters.

All advice even if newer than me would be great!

EDIT - I have done this so far, the input from the user:

clc 
clear

n=input('How many Corners do you have?');
Corners = zeros (n,2);

for row=1:n
   for column=1:2
        usernumber=input('Enter the X and Y coordinates individually:');
        Corners(row, column)=usernumber;
    end
end

I am quite new to maths, so unsure on where to go from here.

[Tim]

bump

Answer 1

[Walter Roberson]

Euclidean distance is the standard sqrt((x2-x1)^2 + (y2-y1)^2)

Answer 2

[Andrei Bobrov]

xy=[0 0
 3 0
 3 3
 0 3];

K = convhull(xy(:,1),xy(:,2));
out = sum(sqrt(sum(diff(xy(K,:)).^2,2)));