Geometrical Puzzle 2

Keep in shape with a geometric conundrum.

of 2

Pentagon puzzle

These pentagons look pretty samey, and in fact most of them have a twin. Except one. Identify the loner.
Pentagon puzzle

Yep, number 14 is the odd pentagon out, loitering on the sidelines like the ugly bloke in a nightclub, dripping tears into his pint. We may have overthought this a little.

Look at that square, lording it over the circles clustered around it...

Pentagon puzzle