How many pieces of track does it take to make a 180 turn?

I am getting ready to buy some track and I was wondering how many pieces of track it would take to make half of a circle?

The track I want to buy is Bachmann EZ track with gray roadbed. I want to have 26" radius.

180° : six peices of 18" radius, eight piece of 22" radius, ten pieces 26", 28", 33¼" and 35½" radii.

THANK YOU

2-3 pieces of flex depending on radius, eh?