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.
Zwillingskreise. Zwillingskreise des Archimedes Archimedes' twin circles de Wfstb de original upload log page de Zwillingskreise Wfstb bytes no Domain selbst erstellt Archimedes' twin circles
Page 2023 Free-images.com. All images are Public Domain