Heptagon
Such a weirdo configuration, its annoyingly resistant to me trying to integrate it
Edit - heres how it came out:
Not bad but still annoyingly uneven
Wheres a damn "kitchen" protractor when you need it?!
Do they have to look the same though? Because you can (mathematically) find a way to get the exact even area of 7 pieces, they might just have different shapes.