Marisa Laks

Marisa Laks
Geometry
97 Lessons
The Global Learning Collaborative
New York, NY
Student Environment:
Urban
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Scale Factor
 
Big Idea: Students use examples from the book Alice’s Adventures in Wonderland to explore the concept of scale factor.
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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.
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Dilations using Geometer's Sketchpad
 
Big Idea: Students using Geometer's Sketchpad to investigate dilations about a variety of centers.
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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.
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Properties of Dilations Extension Lesson
 
Big Idea: Students will investigate how to perform a dilation about a center (h, k) without graphing the object.
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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.
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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.
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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.
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Similar Triangle Practice
 
Big Idea: In this lesson, students apply the properties and theorems studied throughout the unit to justify that triangles are similar.
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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.
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