Learn about and revise angles, lines and multi-sided shapes and their properties with this BBC Bitesize GCSE Maths Eduqas study guide.

The drawing - which was shared on the website for US-based Optics4Kids - is a Kanizsa Triangle and offers no clues to how many triangles are present in the picture.

Learn about and revise angles, lines and multi-sided shapes and their properties with GCSE Bitesize AQA Maths.