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.

Triangle examples: open and closed shapes; with or without straight sides 3. Then create shapes that have differing orientations and sizes. Elicit discussion around the definition of a triangle.

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.