# Marisa Laks

Geometry
97 Lessons
The Global Learning Collaborative
New York, NY
Student Environment:
Urban
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## Geometry

(14 Units, 97 Lessons)

#### 1. Scale Factor

Big Idea: Students use examples from the book Alice’s Adventures in Wonderland to explore the concept of scale factor.
Standards:
Favorites (9)   Resources (14)

#### 2. Dilations on the Coordinate Plane, Center (0, 0)

Big Idea: Students dilate objects on the coordinate plane and identify the scale factor of dilations that take a pre-image to an image.
Standards:
Favorites (2)   Resources (16)

#### 3. Dilations using Geometer's Sketchpad

Big Idea: Students using Geometer's Sketchpad to investigate dilations about a variety of centers.
Standards:
Favorites (1)   Resources (13)

#### 4. Dilations on the Coordinate Plane, Center (h, k)

Big Idea: Students will practice performing and describing dilations with centers other than (0, 0) and scale factors greater than one or between zero and one.
Standards:
Favorites (3)   Resources (19)

#### 5. Properties of Dilations Extension Lesson

Big Idea: Students will investigate how to perform a dilation about a center (h, k) without graphing the object.
Standards:
Favorites (2)   Resources (14)

#### 6. Similar Triangles using Geometer's Sketchpad

Big Idea: Students use Geometer's Sketchpad to investigate properties of similar triangles, which share a vertex and have parallel bases.
Standards:
Favorites (2)   Resources (15)

#### 7. Finding Missing Sides of Similar Triangles

Big Idea: Students will use the criteria for similarity to find the measures of missing sides of a triangle.
Standards:
Favorites (9)   Resources (17)

#### 8. Angle-Angle Similarity Postulate

Big Idea: Students use a variety of tools such as patty paper, rulers, and protractors to prove triangles are similar by comparing angle measurements.
Standards:
Favorites (4)   Resources (15)

#### 9. Similar Triangle Practice

Big Idea: In this lesson, students apply the properties and theorems studied throughout the unit to justify that triangles are similar.
Standards:
Favorites (4)   Resources (17)

#### 10. Similar Triangles and the Flatiron Building

Big Idea: The Flatiron Building located in New York City is one of the most iconic buildings in the country. Its unique triangular shape makes it a great subject for mathematical investigations.
Standards:
Favorites (9)   Resources (17)   Reflections (1)
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