## 2021 Oregon Math Guidance: 3.GM.A.1

**Cluster: 3.GM.A - Reason with shapes and their attributes. **

## STANDARD: 3.GM.A.1

### Standards Statement (2021):

Understand that shapes in different categories may share attributes and that shared attributes can define a larger category.

### Connections:

Preceding Pathway Content (2021) | Subsequent Pathway Content (2021) | Cross Domain Connections (2021) | Common Core (CCSS) (2010) |

2.GM.A.1 | 4.GM.A.1, 5.GM.B.3, 5.GM.D.6 | N/A | 3.G.A.1 3.GM.A Crosswalk |

### Standards Guidance:

#### Clarifications

- Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals).
- Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.
- There should be a focus on the investigation of quadrilaterals, specifically, but other polygons should also be explored.

#### Progressions

- Students should be able to analyze, compare, and classify two dimensional shapes by their properties. Because they have built a firm foundation of several shape categories, these categories can be the raw material for thinking about the relationships between the classes. (Please reference page 13 in the Progression document).

#### Examples

- Compare and classify shapes by their sides and angles.
- Recognize rhombi, rectangles, squares, and trapezoids as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.