## Geometry Curriculum Track In the first grade lessons, students continue their study of shapes by learning to recognize parallel lines, parallelograms, trapezoids, half-circles, and quarter-circles. Defining attributes are distinguished from other attributes, and students draw shapes that possess given defining features. They compose both two- and three-dimensional shapes to form new shapes. They partition circles and rectangles into two and four equal shares and begin their introduction to the language of fractions by using the terms half, fourth, and quarter.

#### Lesson 1: What’s a Polygon with Three Sides?

Students will learn the term polygon as it relates to all closed, flat shapes with three or more straight sides. Next, students identify the defining attributes of triangles. They reason about the defining attributes of triangles as well as non-defining attributes such as color, size, and orientation.

• CCSS.MATH.CONTENT.1.G.A.1
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP4

### MyStemKits 3D Kits Used

•  Basic Shapes: Triangles
• Basic Shapes: Polygons

#### Lesson 2: What’s a Four-Sided Polygon: A Square is a Rectangle, Too?

Students deepen their understanding that a square is a special kind of rectangle. They compare and contrast the defining attributes of squares and rectangles to uncover the similarities and differences.

• CCSS.MATH.CONTENT.1.G.A.1
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP7

### MyStemKits 3D Kits Used

• Angle Tester
• Composing Polygons
• Parallel Line Tester

#### Lesson 3: Hexagons: A Shape with Six Straight Sides

Students identify the defining attributes of hexagons. They apply their understanding by sorting hexagons and non-hexagons, as well as creating and drawing hexagons of various sizes, orientations, and side lengths.

• CCSS.MATH.CONTENT.1.G.A.1
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP7

### MyStemKits 3D Kits Used

•  Basic Shapes: Polygons
• Basic Shapes: Triangles
• Composing Polygons

#### Lesson 4: Introducing Parallel Lines and Trapezoids

Students are formally introduced to parallel lines. They identify parallel lines in two-dimensional shapes using parallel lines testers. Students are then introduced to the defining attributes of trapezoids. They have the opportunity to reason about the defining attributes of trapezoids and non-defining attributes such as color, size, and orientation.

• CCSS.MATH.CONTENT.1.G.A.1
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP7

### MyStemKits 3D Kits Used

• Basic Shapes: Polygons
• Parallel Line Tester

#### Lesson 5: Introducing Parallelograms

Students are introduced to the defining attributes of a parallelogram. They apply their understanding by distinguishing between parallelograms and non-parallelograms.

• CCSS.MATH.CONTENT.1.G.A.1
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP4

### MyStemKits 3D Kits Used

• Composing Polygons (optional)
• Geometry Sticks: Customary (optional)
• Geometry Sticks: Metric (optional)
• Parallel Line Tester

#### Lesson 6: Shapes with Right Angles

Students review the definition of a right angle and then identify right angles in two-dimensional shapes using the right angle tester. Students recognize that some shapes always have right angles, sometimes have right angles, and never have right angles.

• CCSS.MATH.CONTENT.1.G.A.1
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP7

### MyStemKits 3D Kits Used

• Angle Tester
• Basic Shapes: Circles
• Basic Shapes: Polygons
• Basic Shapes: Triangles
• Composing Polygons

#### Lesson 7: Circles, Half Circles, and Quarter Circles

Students are introduced to half-circles and quarter-circles using a foundational understanding of the defining attributes of circles. Students identify and sort half-circles, quarter-circles, and circles.

• CCSS.MATH.CONTENT.1.G.A.2
• CCSS.MATH.CONTENT.1.G.A.3
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP4

### MyStemKits 3D Kits Used

• Basic Shapes: Circles
• Partitioning Circles

#### Lesson 8: Sorting Two-Dimensional Shapes

Students sort two-dimensional shapes based on their defining attributes.

•  CCSS.MATH.CONTENT.1.G.A.1
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP4

### MyStemKits 3D Kits Used

• Basic Shapes: Circles
• Basic Shapes: Polygons
• Basic Shapes: Triangles

#### Lesson 9: Composing Two-Dimensional Shapes

Students combine two-dimensional shapes to compose new shapes. Students are challenged to create composite shapes from smaller shapes.

• CCSS.MATH.CONTENT.1.G.A.2
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP4

### MyStemKits 3D Kits Used

• Basic Shapes: Circles
• Basic Shapes: Polygons
• Basic Shapes: Triangles

#### Lesson 10: Decomposing Shapes

Students will work to decompose known shapes into their component parts. Students will explore and discuss the shapes and their attributes that compose, hexagons, pentagons, and other complex shapes.

• CCSS.MATH.CONTENT.1.G.A.2
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP4

### MyStemKits 3D Kits Used

• Decomposing Shapes
• Tangram

#### Lesson 11: Sorting Three-Dimensional Shapes

Students engage in sorting activities to uncover similarities and differences of three-dimensional shapes. They use the terms faces, bases, and vertices to identify defining attributes.

• CCSS.MATH.CONTENT.1.G.A.1
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP7

### MyStemKits 3D Kits Used

• Basic Shapes: Circles
• Basic Shapes: Right Solids

#### Lesson 12: Composing Three-Dimensional Shapes

Students combine three-dimensional shapes to compose new shapes. Students are challenged to create composite shapes from smaller shapes.

•  CCSS.MATH.CONTENT.1.G.A.2
• CCSS.MATH.PRACTICE.MP3
• CCSS.MATH.PRACTICE.MP4

### MyStemKits 3D Kits Used

• Basic Shapes: Polygons
• Basic Shapes: Right Solids
• Composing Polyhedrons (optional)

#### Lesson 13: Partitioning Circles into Halves and Quarters

Students engage in partitioning circles into equal shares called halves and fourths (quarters). They create and identify circles correctly partitioned into equal shares and use the terms half, fourth, and quarter to name each share.

• CCSS.MATH.CONTENT.1.G.A.3
• CCSS.MATH.PRACTICE.MP2

### MyStemKits 3D Kits Used

•  Partitioning Circles

#### Lesson 14: Partitioning Rectangles into Halves and Quarters

Students partition rectangles into equal shares called halves and fourths (quarters). They create and identify rectangles correctly partitioned into equal shares and use the terms half, fourth, and quarter to name each share.