Can you see any shapes with curved lines? Why not try drawing a picture using only straight lines. A triangle has 3 sides and 3 vertices (corners). A vertex is where two lines meet or join.

Optical illusion often leaves people confused and intrigued. The new trend on the internet asking people to “find the curved lines” is no different. Users on Twitter are sharing the posts in ...

Shapes with 3 sides Explore shapes with 3 sides and look at curved and straight lines. Shapes with 4 sides Explore four-sided shapes looking at straight lines, curved lines and 2D shapes.