For example
Fold a square sheet of paper corner to corner to make a triangle.
In Grade 1
Children handle and sort real flat shapes, counting sides and corners, before they name a triangle from a picture on paper.
Watch out for
Children often accept a triangle only when it sits flat on its base. Turn it upside down and it is still a triangle.
Say it at home
Hunt for triangles around the house and count the three sides each time to check.
Try it together
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