Classify triangles as right, acute, or obtuse.
The student will classify a) angles as right, acute, obtuse, or straight; and b) triangles as right, acute, obtuse, equilateral, scalene, or isosceles.
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The student will identify and trace, describe, and sort plane geometric figures (triangle, square, rectangle, and circle) according to number of sides, vertices, and right angles.
The student will a) define polygon; b) identify and name polygons with 10 or fewer sides; and c) combine and subdivide polygons with three or four sides and name the resulting polygon(s).
Identify the attributes of an object (e.g., color, size, shape, thickness).
Develop strategies to sort and/or group plane geometric figures and refine the vocabulary used to explain their strategies.
Sort plane geometric figures into appropriate subsets (categories) based on characteristics (number of sides, vertices, angles, curved, etc.).