Mathematics: Geometry and Spatial Sense
- determine, through investigation using a variety of tools and strategies, the angle relationships for intersecting lines and for parallel lines and transversals, and the sum of the angles of a triangle
- solve angle-relationship problems involving triangles, intersecting lines, and parallel lines and transversals

- graph the image of a point, or set of points, on the Cartesian coordinate plane after applying a transformation to the original point(s)

Science and Technology: Understanding Structures and Mechanisms 
- 3.2 Identify the purpose, inputs, and outputs of various systems

Basic Scratch menus
These lessons provide opportunities for teachers and students to gather evidence through teacher, peer, and self-assessments; and learning goals and success criteria. See Growing Success: Assessment, Evaluation, and Reporting in Ontario Schools, Chapter 4 for more information.
Computers, devices with Internet Access
This is the minds on button.
View music videos from NUMBEROCK Mathsongs and Socratica

Parallel, Perpendicular, and Intersecting

Complementary, Supplementary, and Vertical Angles

Co-create a list of all the angle terms learned (parallel lines, intersecting lines, transversal, supplementary angles, complementary angles, interior angles, opposite angles, alternate angles, corresponding angles)

This is the action button.

Make a geometry review game using Scratch.

Use the x:y grid as a background.
Use the Pen Tool to draw a set of parallel lines and a transversal.
Create pairs of sprites, for example two letter “O”s that will be used to identify a pair of opposite angles.
Make a new sprite “T” that will be used to identify the transversal.
Make additional sprites as needed to identify all the points on the diagram that correspond to the math terms being reviewed.
Write some code to have the “O”s hidden until the user presses the “o” key on the keyboard.
Follow this procedure for all the other sprites that will be used to identify parts of the diagram.

This is a screenshot of the Scratch program.

One possible answer screen.

This is a screenshot of the Scratch program.

One method of drawing the lines:

This is a screenshot of the Scratch program.

Changing size and display of sprites:

This is the consolidation button.
In the next class, a gallery walk will take place.
Students will sit with various partners during the class to check their games. They will use the co-created list of terms to quiz their classmates. Ask them to point to an area on the diagram that corresponds to a review term. Have them check their answers by tapping the key that will reveal the answer.
Fewer or selected terms could be illustrated.
Gamify the activity. Add a sprite that prompts the user to find the correct location on the diagram. Allow the user to gather points for correct answers. Identify another series of math content/terms and create games to review.