Confusion with triangles, area , perimeter

This is the problem I have. I have absolutely no idea where to start.

1. Write a MATLAB script called Triangle to calculate the perimeter P of the triangle A-B-C defined by the x and y coordinates of points A, B, and C as listed below.

The length of triangle side a = sqrt( (Bx – Cx)2 + ( By– Cy)2 ),

Where Bx and Cx are the x-coordinates of points B and C, and By and Cy are the y-coordinates of points B and C.

Therefore for the points shown below, length of side a = sqrt( (220 – 480)2 + ( 320 – 230)2 )

x y Point coordinates in feet: A ( 90 , 130 ) B ( 220 , 320 ) C ( 480 , 230 )

2. Add to the script a formula for calculating the area of the triangle