CCSS.Math.Content.2.G.A.1
The standard
Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces. Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.
Common Core State Standards for Mathematics · Geometry
What this standard means
Students need to name and draw common flat shapes by their features, not just by how they look. They should count sides and angles, then use those counts to identify triangles, quadrilaterals, pentagons, and hexagons. They also need to recognize cubes and notice equal square faces.
Mastery looks like a student saying, “It has 5 sides and 5 angles, so it is a pentagon,” even if the shape is turned or stretched. Students often get stuck when shapes are irregular, rotated, or when they mix up sides, angles, and faces.
Ways to teach it
- Give students straws and twist ties to build triangles, quadrilaterals, pentagons, and hexagons, then label sides and angles with sticky notes.
- Ask students to write, “I know this shape is a ___ because ___,” using side and angle counts as evidence.
- Show five mixed shape cards for 30 seconds, then have students sort and name them on mini whiteboards.
- Have students find classroom examples of cubes and flat shapes, then explain which attributes prove each name.
Plan a lesson for CCSS.Math.Content.2.G.A.1
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