Geometry- Reason with shapes and their attribute
1.G.1 Distinguish between defining attributes versus non-defining attributes for a wide variety of shapes. Build and/or draw shapes to possess defining attributes.
1.G.2 Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape. Note: Students do not need to learn formal names such as “right rectangular prism.”
1.G.3 . Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.
How do we identify shapes?
- Two and three dimensional shapes have attributes that allow them to be identified.
- Some shapes are composed from other shapes. Some shapes can be decomposed into smaller shapes.
How do we recognize wholes and parts?
- Composite shapes can be composed and decomposed into parts.
- Some shapes can be broken into smaller equal parts.
- Two equal parts of a whole are called halves.
- Four equal parts of a whole are called quarters or fourths.
- The more equal parts a whole is broken into, the smaller each part is.