Common Core · Grade 4
4.G.A.2
Grade 4 — Classify two-dimensional figures by the presence of parallel or perpendicular lines and by angle size.
The skill that covers it
What a student should be able to do
- Classify triangles by sides and by angles.
- Find a missing angle using the 180-degree angle sum.
- Apply the exterior angle theorem.
- Decide whether three lengths can form a triangle.