What do you notice about all of the shapes in part A? What are all of these shapes called?
They all have 4 sides, 4 corners, 2 sides with the same length, and 2 other sides with the same length. They are all rectangles.
What do you notice about all of the shapes in part B? What are all of these shapes called?
They all have 4 equal sides that are the same. They also have 4 corners. They are all called squares.
The shapes in part C are called triangles. They are different sizes and colors. What makes them all triangles?
They all have 3 straight sides and 3 angles.
Look at the shapes in part D. Which shapes are not triangles? How do you know?
Shape 1, shape 3, shape 4, and shape 6 are not triangles. Shape 1 is not closed. Shape 3 has 1 curved side. Shapes 4 and 6 have 4 sides.
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