### The MailboxPublished on Student will use the Measurement tools found in the Geometry menu options or model the image using functions on the Graph page | | Download143 |

### Reflections and RotationsUpdated on Students will reflect figures over the *x*- and *y*-axes. By studying what happens to the coordinates of the pre-image and image points, they will write rules for reflecting points over the axes. Students will then rotate figures about the origin, in both clockwise and counterclockwise directions. Again, they will study what happens to the coordinates of the pre-image and image points to write rules for reflecting points 90° and 180° about the origin. | | Download2,950 |

### Scaling the GeometryPublished on This lesson involves scale drawings of actual images on the TI-Nspire handheld. | TI-Nspire™ CX TI-Nspire™ CX CAS TI-Nspire™ Navigator™ TI-Nspire™ TI-Nspire™ CAS
| Download2,285 |

### SlicesUpdated on This lesson involves exploring the shapes formed from 3D figures cut by a horizontal and/or a vertical plane.
• Compatible TI Technologies: TI-Nspire™ CX Handhelds, TI-Nspire™ Apps for iPad®, TI-Nspire™ Software | | Download2,508 |

### Getting "A-Round" AreaUpdated on This lesson involves using sectors of a circle to form a parallelogram and, from this shape, investigating the area formula for a circle. | | Download2,383 |

### Angles for a SolutionUpdated on This lesson involves looking at several sketches of intersecting lines and determining the measures of the missing angles using the facts about supplementary, complementary, vertical, and adjacent angles. | | Download2,487 |

### We've Got You Covered: 2D AreaPublished on This lesson involves using the geometry tools to measure the area of two-dimensional shapes from the faces of three-dimensional objects they see in pictures taken outside of the classroom. | TI-Nspire™ CX TI-Nspire™ CX CAS TI-Nspire™ Navigator™ TI-Nspire™ TI-Nspire™ CAS
| Download2,338 |

### The Pentagon ProblemUpdated on This activity provides a simple, virtual "geoboard" that allows students to manipulate the polygon displayed on a unit grid. The grid squares provide a visual means of finding area. | | Download2,176 |

### Transformers in the ClassroomPublished on This lesson involves digitizing an image and transforming it on a graph. | TI-Nspire™ CX TI-Nspire™ CX CAS TI-Nspire™ Navigator™ TI-Nspire™ TI-Nspire™ CAS
| Download2,206 |

### What's Right about TrianglesUpdated on This lesson involves examining a visual proof of the Pythagorean Theorem and supporting what happens geometrically. | | Download2,702 |

### Volume RelationshipsUpdated on This lesson involves the volume formula for cylinders, cones, and spheres. | | Download2,813 |

### Exploring Areas of Irregular PolygonsUpdated on Explore different ways to find areas of irregular polygons using the three basic shapes of rectangles, parallelograms, and triangles. | | Download6,873 |

### Creating Parallel Lines and TransversalsUpdated on Create a pair of parallel lines cut by a transversal and investigate the relationships among the angles that are created. | | Download7,629 |