total area of a poylgon?

[ashagplz]

anyone know how to calculate the total area of a polygon? Im trying to work out the total square km for a polygon of:
5.2km x 1.2km x 2.4km x 2.4km x 3.6km

 

[ashagplz]

i did try a google search but couldnt find anything i understood...

 

[ashagplz]

i was trying to calculate the aproximate area that heathrow airport occupies...if you look at a map its basically a polygon bounded by the A4, A30, southern and western perimeter roads.....

map