4.G.1.c: Justify the classification of two-dimensional shapes based on the presence or absence of parallel and perpendicular lines or the presence or absence of specific angles.

Justify the classification of two-dimensional shapes based on the presence or absence of parallel and perpendicular lines or the presence or absence of specific angles.

Example Problems
Are both trapezoids and parallelograms quadrilaterals?
Do polygons have more than 2 sides?
Are circles and octagons both polygons?
Khan Academy Resources
Types of triangles reviewQuadrilaterals reviewClassify triangles by anglesClassify triangles by both sides and anglesClassify shapes by line and angle typesQuadrilateral propertiesWorked example: Classifying triangles Classifying shapes by lines and anglesClassifying triangles Classifying shapes by line and angles types
Goblins

1-on-1 AI tutoring aligned to 4.G.1.c. Instant help for students, real-time insights for teachers.

Used in classrooms by 100,000+ students at Baltimore County, Plano ISD, Deer Valley USD, KIPP, and districts nationwide.

Free for teachers, forever →