Triangles...
Triangles are amazing shapes - you can make music with them.
Triangles have also cemented their place as an engineering necessity - in fact, the Eiffel Tower in Paris has exactly 186 triangles in it.
They are used in engineering because they are the strongest shapes when it comes to building large structures.
The area of a [non-right-angled triangle] could be worked out by using ½abSinC, however, I'm not sure how often you will use that in an iGP Manager race... Probably never, but you never know.
Anyway, just came here to say that Triangles are better than windmills.