Curated OER
Proportions and Similar Figures
Duane demonstrates how to find a missing length in figures that are similar. In this example he uses two similar triangles.
Loyola University Chicago
Math Flix: Proportion Similar Figures
This QuickTime movie applies the concept of proportion to similar geometric figures. As you watch and listen to the teacher and students interact it helps clarify the thinking behind applying this concept. Allow loading time.
Sophia Learning
Sophia: Similar Figures: Lesson 5
This lesson defines the phrase similar figures. It is 5 of 6 in the series titled "Similar Figures."
Virtual Nerd
Virtual Nerd: Find Missing Measurements of Similar Figures Using a Proportion
Video tutorial delves into how to find a missing measurement on similar figures by using proportions. [6:22]
Virtual Nerd
Virtual Nerd: What Are Similar Figures?
Two figures that are the same shape and have the same angle measurements are similar figures. Learn all about them in this tutorial. [7:22]
Virtual Nerd
Virtual Nerd: What Are Corresponding Parts in Similar Figures?
Video tutorial explains how to identify corresponding parts in similar figures. [6:28]
Khan Academy
Khan Academy: Worked Examples: Geometry: Ca Geometry: Similar Triangles 1
In this video tutorial students explore a proof using similar triangles.
Sophia Learning
Sophia: Corresponding Parts
In this video tutorial [7:00], students will explore corresponding parts of similar objects, and determine that angles are congruent and sides are proportional.
Sophia Learning
Sophia: Finding Scale Factors
This video tutorial demonstrates how to calculate the scale factor for two similar figures. [4:11]
Sophia Learning
Sophia: Introduction to Triangle Similarity
Similar Triangles are explored in this video lesson. Students can check their understanding with an assessment. [5:51]
Sophia Learning
Sophia: Practice Determining Triangle Similarity
Compare angle measures and side length to determine if triangles are similar. Assess learning with a quiz.
Sophia Learning
Sophia: Pre Algebra: Indirect Measurement
Indirect measurement using shadows and proportions is explored in this video lesson. The tutorial includes a very detailed example of the concept.
Sophia Learning
Sophia: Scale and Similar Figures
This video tutorial [5:22] explores how objects are represented in a scale drawing to show they are similar. Assess learning with a quiz.
Sophia Learning
Sophia: Scale Factor and Area of Similar Figures
This video lesson [3:02] demonstrates how the scale factor and area of similar figures are related.
Sophia Learning
Sophia: Scale Factor and Area of Similar Figures
A relationship between scale factor and area can be determined using similar figures. Assess learning with a quiz.
Sophia Learning
Sophia: Scale Factor and Volume of Similar Figures
This video lesson [3:38] demonstrates how to use scale factor to calculate the volume of similar figures. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Scale Factor and Volume of Similar Solids
Explore the relationship between scale factor and volume of similar solids. Assess learning with a quiz.
Sophia Learning
Sophia: Similar Figures
Similar figures are investigated in this video lesson. [4:30] It provides detailed examples using proportional relationships. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Similar Polygons and Their Perimeters
Multiply the perimeter of a smaller polygon by the scale factor to determine if polygons are similar in this video tutorial. [2:16] Assess learning with a quiz.
Sophia Learning
Sophia: Similar Solids
This video tutorial demonstrates how to determine if two solids are similar. The lesson includes detailed examples of the skill.
Sophia Learning
Sophia: Similar Solids
Explore how objects can have the same shape but not the same size and how they are categorized as similar solids. Assess learning with a quiz.
Sophia Learning
Sophia: Similar Solids and Similar Figures
This video tutorial describes what makes solids and figures similar. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Solving for Unknown Angles of Similar Triangles
Explore similar triangles and how to solve for unknown angles in this video tutorial. Check understanding with a quiz. [3:45[
Sophia Learning
Sophia: Surface Area and Volume in Similar Solids
Explore how similar solids affect surface area and volume. Assess learning with a quiz.