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:
Gossard perspector generalisation. Animation illustrating generalisation of the Gossard triangle Krishnachandranvn talk created this work entirely by myself June UTC Krishnachandranvn talk Krishnachandranvn en Cczero Original upload log en Gossardperspectorgeneralisation bytes Krishnachandranvn Some changes in colours