This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Developpante cercle. Dveloppante du cercle Contribution personnelle et peuttre un peu approximative mais suffisamment explicite fr Bloodylibu CommonsHelper JeanClaude Duss fr JeanClaude Duss Original upload log page fr Developpantecercle JeanClaude Duss bytes no du cercle Curves Original upload log bytes File