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Understanding Trapezoids and Non-Parallelogram Quadrilaterals

Classifying and Comparing 2D Shapes: Triangles and Quadrilaterals

3rd Grade·Math·Open Global Math

Updated 1 month ago · 3 views

Identify trapezoids (quadrilaterals with at least one pair of parallel sides) and general irregular quadrilaterals.

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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

Classifying Triangles by Angles: Acute, Right, ObtuseUp next
Classifying Triangles: Equilateral, Isosceles, and ScaleneNot started yet
Combining Triangle Attributes by Sides and AnglesNot started yet
Sorting Squares, Rectangles, and RhombusesNot started yet
Understanding Trapezoids and Non-Parallelogram QuadrilateralsYou are here
Quadrilateral Hierarchies: True or False StatementsNot started yet
Drawing Polygons with Specified Side and Angle PropertiesNot started yet
Comparing Regular and Irregular PolygonsNot started yet

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Learning standards covered

OGM.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.