**Scratch Part 4: Pen Tools and Geometry**

Geometry Rubric

**Overall Objectives:**

- To gain a better understanding of geometry: including angles, geometric figures and some geometric terms (polygon, quadrilateral, equilateral, equiangular, closed, open, regular, supplementary angles, internal angles, external angles.)

- To experiment with math in a fun way.

- To add more programming skills to your Scratch tool kit.

**Lesson 1: Geometry**

**Objective:**To expand our knowledge of angles, triangles and other geometric shapes.

**Activator:**Tell me what you know about squares. Tell me what you know about triangles.

**Mini Lessons:**

Math Vocabulary: polygon, regular, supplementary angle, complementary angle

Finding the internal and external angles of geometric figures

**Student Engagement:**

Sample Project

Find the internal and external angles of:

a square, triangle, pentagon, hexagon, octagon.

Record your information in a chart in your composition books.

**Wrap-up:**Does a circle have internal and external angles? Why or why not?

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**Lesson 2: Pen Tools**

**Objective:**To learn how to use the Scratch pen, turn, and move scripts to draw geometric shapes.

**Activator:**

How could you make a sprite walk (using repeat, move, and turn) in a square path?

(Write the code in your composition books.)

**Mini Lessons:**

How would we draw a triangular path?

Internal and external angles

Pen tools

**Student Engagement:**

Create a project where your sprites draw:

a square, triangle, pentagon, hexagon, octagon, and a circle.

**Wrap-up:**Save this project to work with again tomorrow.

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**Lesson 3: Make Your Own Blocks**

**Objective:**To learn how to make your own blocks in Scratch.

**Activator:**What did you learn about polygons and angles in our last class?

**Mini Lesson:**Learn how to use More Blocks to make your own block. Experiment with shape blocks to create spirals.

**Student Engagement:**NOTE: Open the Polygon projects that you already created and edit it.

Use the make a block command, so that you have a block for each shape where the size of your shape can vary.

Make blocks for:

1. a square

2. a regular triangle

3. a regular pentagon

4. regular hexagon

5. a regular octagon

6. a circle

**Wrap-up:**When you are done, save your work. You will build off of this project tomorrow.

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**Lesson 4: Geometry Project**

**Objective:**To combine your polygons and circles in different ways to draw beautiful geometrical figures.

**Activator:**Look at some examples of geometrical figures.

**Mini Lesson:**How to use your shapes to make cool spirographs.

**Student Engagement:**Experiment with your shapes. Add a spirograph to your project..

**Wrap-up:**When you are done, save your work.

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Lesson 5: Spirals

Lesson 5: Spirals

**Objective:**To learn how to make a variable in Scratch. To add a spiral to your geometry project.

**Activator:**What is a variable?

**Mini Lesson:**Learn how to make a variable. Look at spirals? Use variables to make a spiral.

**Student Engagement:**Make spirals and experiment with shapes and pen tools.

**Wrap-up:**When you are done, share your work.

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Lesson 5: Tesselations (Haven't done this yet.)

Objective: To learn how to tesselate a square

Activator: Escher Video

Mini Lesson: How to tesselate a square in Scratch

Student Engagement: Create a square sprite using translation.