Calculating area on N points

Question

Im trying to calculate numerically an area of different shapes where the only thing I know about them is the (x,y) of each corner.

For example the shapes are:

P.s. The points inside the shape are for other calculation, I only need the area of the most outer shape.

Thank you.

Answer 1

Create polygon, and use polyarea function.

Given x,y location of corners than:

Area=polyarea(x,y)