Khan Academy
Khan Academy: Worked Examples: Geometry: Ca Geometry: Similar Triangles 1
In this video tutorial students explore a proof using similar triangles.
Khan Academy
Khan Academy: Triangles: Finding Area Using Similarity and Congruence
Explains how to determine the area of a pentagonal shaded region in a triangle. The triangle that is broken into multiple similar and congruent triangles.
Khan Academy
Khan Academy: Similarity Example Where Same Side Plays Different Roles
Explains how to determine unknown side lengths in a diagram that involves similar triangles where the two triangles share a side and the shared side corresponds to two different sides in each triangle.
Khan Academy
Khan Academy: Rates of Change: Speed of Shadow of Diving Bird
A video showing an aplication using related rates.
Khan Academy
Khan Academy: Perpendicular Bisectors: Area Circumradius Formula Proof
Proof of the formula relating the area of a triangle to its circumradius.
Sophia Learning
Sophia: Indirect Measurement
This video lesson defines and provides an example of indirect measurement.
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: 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: Solving for Unknown Sides of Similar Triangles
Solve for unknown sides of similar triangles and take a quiz to assess learning.
Sophia Learning
Sophia: Using Similar Triangles to Make Indirect Measurements
This video lesson demonstrates how similar triangles can be used to make indirect measurements. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Solving for Unknown Sides of Similar Triangles
Learn how to solve for unknown sides of similar triangles and assess learning with a quiz.
Khan Academy
Khan Academy: Triangles: Intro to Triangle Similarity
Explains what it means for two triangles to be similar. Diagram of similar triangles is created with two parallel lines cut by two transversals.
Khan Academy
Khan Academy: Triangles: Similarity Example Problems
Explains how to identify and use similar triangles in order to determine unknown side lengths in two given diagrams.
Khan Academy
Khan Academy: Worked Examples
Students watch a video about similar and congruent triangles.
Khan Academy
Khan Academy: Triangles: Similar Triangle Example Problems
Demonstration on how to determine if triangles are similar based on AA, SSS, or SAS similarity postulates.
Khan Academy
Khan Academy: Triangles: Pythagorean Theorem Proof Using Similarity
This video shows a proof for the Pythagorean Theorem by breaking a right triangle into two similar triangles and setting up ratios of corresponding sides.
Imagine Learning Classroom
Learn Zillion: Find Tangent Value Using Side Ratios
In this lesson, you will learn how the ratios of certain sides of the triangle determine the tangent value of a particular angle by using properties of similar triangles. [2:13]
Loyola University Chicago
Math Flix: Isosceles Right Triangle
This QuickTime movie provides an opportunity to learn about the characteristics of the isosceles right triangles. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.
Loyola University Chicago
Math Flix: Similar Figures: Cross Multiplication
This QuickTime movie provides an opportunity to develop the basic geometric term, similar, by using cross multiplication to see if figures are similar. As you watch and listen to the teacher and student interact it helps clarify the...
Khan Academy
Khan Academy: Ca Geometry: More on Congruent and Similar Triangles
Worked examples of similar and congruent triangles.
Khan Academy
Khan Academy: Triangle Similarity & the Trigonometric Ratios
Sal explains how the trigonometric ratios are derived from triangle similarity considerations.
Khan Academy
Khan Academy: Geometry Word Problem: A Perfect Pool Shot
Sal uses triangle similarity to plan the perfect shot in a pool game.