Classifying Triangles 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. You can also use this page to find sample questions, apps, worksheets, lessons , infographics and presentations related to Classifying Triangles.


Equilateral Triangles


By yourteachermathhelp

In this lesson students learn to classify triangles as scalene (all sides have different lengths) isosceles (at least two sides have the same length) or equilateral (all sides have the same length). Students also learn that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

Acute Triangle - YourTeacher.com - Geometry Help


By yourteachermathhelp

In this lesson students learn to classify triangles as acute (all angles acute) right (one angle right) or obtuse (one angle obtuse). Students also learn that the sum of the measures of the angles of a triangle is 180 degrees and students are asked to use this formula to find the measures of missing angles in given triangles.

Learn Equilateral, Scalene & Isosceles Triangles and Acute, Obtuse & Right Triangles - [15]


By Math and Science

Quality Math And Science Videos that feature step-by-step example problems!

Special Right Triangles in Geometry: 45-45-90 and 30-60-90


By PatrickJMT

Special Right Triangles in Geometry: 45-45-90 and 30-60-90 degree triangles. In this video, I discuss two special right triangles, how to derive the formulas to find the lengths of the sides of the triangles by knowing the length of one side, and then do a few examples using them!

Triangles


By MathPlanetVideos

Find out whether the triangles are right, isosceles, acute, scalene, obtuse or equilateral

30-60-90 Triangles II


By Khan Academy

More examples using 30-60-90 triangles.. All Khan Academy content is available for free at www.khanacademy.org

Similar Triangles, Part 2 - Khan Academy


By Khan Academy

Video uses an electronic black board with different-colored pens. In this video. Mr. Khan discusses the measurement of alternate interior angles, corresponding angles and how they are similar. Triangles are drawn in two parallel lines and a transversal. Narrator shows how to figure out the length of the sides of the angles when three sides are known. Good quality video. Good for middle elementary and middle school students.

45-45-90 triangles | Right triangles and trigonometry | Geometry | Khan Academy


By Khan Academy

Video uses an electronic black board with different colored pens. Introduction to 45-45-90 Triangles, these can also be called right triangles because of the 90 degree measurement. These triangles are special because if two angles of a triangle are equal the one side they don’t share is going to be equal. This then goes on to explain Pythagorean Theorem, Side A squared + Side B squared = Side C squared, side C is the hypotenuse or the side that is shared in a triangle. The narrator goes on to explain how to solve, using square roots. This video is for middle school students.

Similar Triangles, Part 2 - Khan Academy


By Khan Academy

Video uses an electronic black board with different-colored pens. In this video. Mr. Khan discusses the measurement of alternate interior angles, corresponding angles and how they are similar. Triangles are drawn in two parallel lines and a transversal. Narrator shows how to figure out the length of the sides of the angles when three sides are known. Good quality video. Good for middle elementary and middle school students.

Geometry - 10 - Proving Triangles are Similar


By thenewboston

Youtube Presents Geometry - 10 - Proving Triangles are Similar an educational video resources on math.

More about triangles


By MathPlanetVideos

Find the measure of the angles ∠EBFand∠FCB

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

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

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.

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

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

Introduction to 45-45-90 Triangles

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.