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Students who are still at van Hiele's Level 1 (visualization) will not develop a solid understanding of what it means to be a triangle if they only see equilateral triangles. To move students to the next level, a teacher needs to show them examples of similar objects that are not triangles, as well as obtuse and scalene triangles and triangles where the base in not horizontal. Using this approach when introducing each new figure will help students later in their schooling to place figures appropriately in the hierarchy of figures.
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