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.
Valcova soustava souradnic.svg Bod ve vlcov soustav souadnic Transferred from org cs transferred to Commons by User Sevela using de php CommonsHelper Pajs at org cs cs Pajs original upload log page cs Valcovasoustavasouradnic svg Pajs bytes no ve vlcov soustav souadnic Cylindrical coordinates
Page 2023 Free-images.com. All images are Public Domain