This Sorting 2-Dimensional Shapes worksheet also includes:
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Some shapes have square corners, and some do not. Scholars participate in a sorting activity as they determine if these 12 shapes have square corners, categorizing them based on this attribute. Encourage geometers to draw the square into the corner to help them keep track. There is an example modelling this. You may also want to hand out index cards or something with a right angle to help kids check close angles.