Classifying Triangles by Angles and Sides Videos - Free Educational Videos for Students in K - 12


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This page provides a list of educational videos related to Classifying Triangles by Angles and Sides. You can also use this page to find sample questions, apps, worksheets, lessons , infographics and presentations related to Classifying Triangles by Angles and Sides.


Solving similar triangles 1


By Khan Academy

Sal solves two problems where a missing side length is found by proving that triangles are similar and using this to find the measure.

      Special right triangles


      By Khan Academy

      Using what we know about 30-60-90 triangles to solve what at first seems to be a challenging problem

          Special right triangles


          By Khan Academy

          A few more 45-45-90 examples and an introduction to 30-60-90 triangles.

              Special right triangles


              By Khan Academy

              Showing the ratios of the sides of a 45-45-90 triangle are 1:1:sqrt(2)

                  Similar triangles 1


                  By Khan Academy

                  Sal reviews all the different ways we can determine that two triangles are similar. This is similar to the congruence criteria, only for similarity!

                      Solving problems with similar and congruent triangles


                      By Khan Academy

                      Sal uses the similarity of triangles and the congruence of others in this multi-step problem to find the area of a polygon.

                          Special right triangles


                          By Khan Academy

                          Introduction to 45-45-90 Triangles

                              Find missing angles of triangles


                              By Khan Academy

                              Three example problems involving isosceles and equilateral triangles (partly taken from Art of Problem Solving, by Richard Rusczyk).

                                  Find missing angles of triangles


                                  By Khan Academy

                                  Sal solves the following problem: The measures of two angles of an isosceles triangle are 3x+5 and x+16. Find all possible values of x.

                                      Find missing angles of triangles


                                      By Khan Academy

                                      Sal combines what we know about isosceles triangles and parallel lines with the power of algebra to solve the angles of an isosceles triangle.

                                          Trigonometric functions of special angles


                                          By Khan Academy

                                          Sal finds the trigonometric values of���������������������������/4.

                                              Sine Values from Special Triangles


                                              By outofmylaboratory

                                              YouTube presents Sine Values from Special Triangles an educational video resources on math.

                                                  Inscribed Angles


                                                  By Wes Przybylski

                                                  This video provides a relatively quick lesson about inscribed angles and inscribed polygons. Uses diagrams to illustrate concepts.

                                                      Introduction to Geometry - 21 - Identifying Similar Triangles AA


                                                      By thenewboston

                                                      "AA" stands for "Angle-Angle." This means that if two triangles are known to have two corresponding angles that are equal in measure, then the two angles are similar.

                                                          Using Corresponding Parts Of Congruent Triangles Are Congruent


                                                          By MrPilarski

                                                          YouTube presents Using Corresponding Parts Of Congruent Triangles Are Congruent, an educational video resource on math.

                                                              Proving Triangles are Similar - YourTeacher.com - Geometry Help


                                                              By yourteachermathhelp

                                                              Students learn the following theorems related to similar triangles. If an angle of one triangle is congruent to an angle of another triangle, and the lengths of the sides that include each angle are in proportion, then the triangles are similar (Side-Angle-Side Similarity Theorem, or SAS Similarity Theorem). If the lengths of the sides of two triangles are in proportion, then the triangles are similar (Side-Side-Side Similarity Theorem, or SSS Similarity Theorem). Students are then asked to determine whether given triangles are similar based on these theorems.

                                                                  9.7 Special Right Triangles (Lesson)


                                                                  By AutenMath

                                                                  A review of practice problems using knowledge of special right triangles (30, 60, 90) and (45, 45, 90)

                                                                      9.7 Special Right Triangles (Practice)


                                                                      By AutenMath

                                                                      9.7 Special Right Triangles (Practice)

                                                                          Triangle Congruence by SSS and SAS - How to Prove Triangles Congurent


                                                                          By MrPilarski

                                                                          YouTube presents Triangle Congruence by SSS and SAS - How to Prove Triangles Congurent, an educational video resource on math.

                                                                              How to Solve Similar Triangles Applications: Flagpole Problem


                                                                              By Math Class with Terry V

                                                                              YouTube presents How to Solve Similar Triangles Applications: Flagpole Problem, an educational video resource on math.