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Curated Video
Find Corresponding Angles of Similar Triangles
In this short video we will answer a standardized math test question where we are asked to identify a missing angle of a triangle. We will review the definition and meaning of similar triangles. We will identify which angle corresponds...
Curated Video
Determining Similarity of Figures Using Dilations and Scale Factors
This video explains how to determine if two figures are similar using dilations and scale factors. It reviews the concept of similar figures, which have the same shape but different sizes and corresponding congruent angles. The video...
Curated Video
Understanding the Relationships between Similar Triangles through Translations and Dilations
This video explains the concept of similar triangles and their side and angle relationships. The video discusses how similar triangles have the same shape but not necessarily the same size, and how dilations and translations can be used...
Curated Video
Finding Missing Measures in Similar Figures
In this lesson, students will learn how to find missing measures in similar figures by solving algebraic equations. They will review rigid transformations and understand how to determine if polygons are similar.
Curated Video
Finding Angle Measurements Using Corresponding Angles
In this video, students will learn how to find the measurements of angles created when parallel lines are cut by a transversal by using corresponding angles. The video explains the concept of corresponding angles in similar figures and...
Curated Video
Exploring Similarity: Comparing Triangles with Congruent Angles
In this video, the teacher explains the concept of similarity in triangles by comparing congruent angles. They differentiate between congruent and similar figures, highlighting that similar figures have the same shape but not the same size.
Khan Academy
Similar Triangles, Similarity, Geometry
Although a rather complicated topic, this video clearly explains the concept of solving problems involving similar triangles. It employs problem-solving to determine whether two figures are similar triangles. In addition, it provides...
Khan Academy
Similar Triangles (Part 2), Similarity, Geometry
Building on concepts in the first part of the series on similar triangles, installment number two explores how to find the values for given angles in a triangle. These problems are solved by using algebra and ratios. A step-by-step...
Flipped Math
Unit 6 Review: Similar Figures
After a short review of the material from the Similar Figures Unit, pupils work through 18 problems to further practice the skills from the unit. Scholars apply those skills in the application problems at the end of the review.
Flipped Math
Similar Figures
Use some similar problems to find side lengths. Pupils learn the definition of similar figures and how it relates to corresponding angles and sides. Using the definition, individuals calculate the lengths of missing sides and practice...
PBS
Human Tree: Dilations
Look at dilations exponentially. Using a fractal from a museum exhibit, the installment from the Math at the Core: Ratios series introduces the term dilation. The presenter points out that dilations can make images either smaller or...
Corbett Maths
Similar Shape Volumes
More power to you if you can calculate volumes. Viewers of an informative YouTube video learn about the volumes of similar three-dimensional figures. They see how figures with sides that have a scale factor of n have volumes with a scale...
Corbett Maths
Similar Shapes Areas
Just how similar are the areas of similar figures? An educational YouTube video describes how to determine the areas of similar figures. Given the area of one figure and the measurements of corresponding sides of each figure, viewers see...
Corbett Maths
Similar Shapes Sides
Scale up a lesson on similarity. Young mathematicians watch a video that investigates the sides of similar figures. They see how to calculate missing sides from the given measures using scale factors.
Corbett Maths
Congruent and Similar Shapes
By definition, a congruent shape remains similar, but similar shapes may or may not be congruent. Scholars watch a video explaining the sometimes-confusing concept. Practice problems ensure pupils demonstrate their understanding to...
CK-12 Foundation
Similar Solids: Lesson
Blow up a solid by a scale factor. A section of a larger playlist on basic geometry introduces the ratios of the surface areas and volumes of similar solids. Using the ratios, the video works several examples involving similar figures.
CK-12 Foundation
Area and Perimeter of Similar Polygons: Lesson
Find the square of the scale factor. A component of a large playlist on geometry discusses the ratios of the perimeters and areas of two similar polygons. The resource shows examples in finding the ratios that lead to a pattern.
CK-12 Foundation
Similar Polygons and Scale Factors: Lesson
Develop an understanding of the scale of similarity. Starting with the concept of congruency, the resource introduces the idea of similarity between two figures. As part of a larger playlist on geometry, it defines similarity and uses...
CK-12 Foundation
Self Similarity: Lesson
Zoom in to reveal more of the same. The resource introduces the concept of self similarity. Using a simple example, the video—part of a larger playlist covering geometry concepts—illustrates the meaning of a self similarity figure.
CK-12 Foundation
Dilation in the Coordinate Plane: Lesson
Multiply coordinates to either shrink or enlarge a figure. An informative segment of a geometry playlist introduces dilation on the coordinate plane. The dilations in the resource use the origin as the center of dilation, which makes...
Mathed Up!
Enlargements
Make enlargements with and without centers. Pupils work through seven problems dealing with dilations or enlargements. The first couple items are strict enlargements without centers, while the others have centers. Class members also...
Curated OER
How Do You Find a Scale Factor in Similar Figures?
Three angles of one triangle are equal to the corresponding angles in another triangle. Use a ratio of corresponding sides to find the scale factor. Actually, there are two scale factor values. The instructor will explain how to get both...
Curated OER
How Do You Solve a Problem Using Indirect Measurement with Shadows?
Using indirect measurement, this video shows viewers how to find the height of a flagpole. The lecturer employs drawings as well as proportions to solve this problem, explaining each step. A useful resource to aid struggling learners and...
Curated OER
How Do You Solve a Problem Using Indirect Measurement with Shadows?
Using indirect measurement, this video shows viewers how to find the height of a flagpole. The lecturer employs drawings as well as proportions to solve this problem, explaining each step. A useful resource to aid struggling learners and...