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Classifying and Comparing 2D Shapes: Triangles and Quadrilaterals

3rd Grade · Math · Open Global Math

8 lessons

Goal

Classify, describe, and compare triangles and quadrilaterals by side lengths, angle types, and parallel or perpendicular side properties.

8 lessons
0 of 8 done
  1. Classifying Triangles by Angles: Acute, Right, ObtuseUp next
  2. Classifying Triangles: Equilateral, Isosceles, and ScaleneNot started yet
  3. Combining Triangle Attributes by Sides and AnglesNot started yet
  4. Sorting Squares, Rectangles, and RhombusesNot started yet
  5. Understanding Trapezoids and Non-Parallelogram QuadrilateralsNot started yet
  6. Quadrilateral Hierarchies: True or False StatementsNot started yet
  7. Drawing Polygons with Specified Side and Angle PropertiesNot started yet
  8. Comparing Regular and Irregular PolygonsYou are here
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Learning standards covered

GlobalOGM.4.G.1Open Global Math Standards 2026™ · 3rd Grade

Classify, describe, and compare two-dimensional shapes (triangles: acute, right, obtuse, isosceles, equilateral; quadrilaterals: rectangles, squares, rhombuses, parallelograms, trapezoids) and three-dimensional solids (cubes, rectangular/triangular prisms, pyramids, cylinders, cones, spheres) based on sides, vertices, edges, and face properties.