A series of mind-boggling puzzles have been sweeping the web - but the latest might be the toughest yet. The tricky test features three main images - two triangles and a hexagon. Each shape is divided ...

A fiendishly tricky optical illusion challenging people to find all of the triangles in the image is the latest puzzle driving the internet to distraction. The drawing - which was shared on the ...

A brainteaser has swept social media and left many confused - as the optical illusion image asks if you can count 18 triangles in a simple black and white drawing. According to experts, only those ...

Understanding different types of angles and that angles in a triangle sum to 180° can be helpful when classifying a triangle. Recognising line symmetry and rotational symmetry will also help. Look for ...