Angle and Side Relationships Videos - Free Educational Videos for Students in K - 12

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This page provides a list of educational videos related to Angle and Side Relationships. You can also use this page to find sample questions, apps, worksheets, lessons , infographics and presentations related to Angle and Side Relationships.


15.2 Inequalities in a Triangle (Lesson)


By AutenMath

A lesson on the inequality theorems and relationships of side length and angle measures in a triangle

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)

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.

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.

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.

Trigonometric functions of special angles


By Khan Academy

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

Inscribed Angles


By Wes Przybylski

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

Inscribed angles and polygons


By MathPlanetVideos

Find the value of the angle x in the figure.

Sine Values from Special Triangles


By outofmylaboratory

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

Angles: Composition Measuring


By tiorico1

The instructor uses an electronic sketchpad to demonstrate how to constucut angles. Video discusses vocabulary and symbols associated with angles ray (sides of the angle) vertex (the point where the rays start). It then goes on to use the protractor to measure an angle. It starts with where to put one line of the angle and then where and what to measure. It also instructs students which set of numbers to use on a protractor. Then examples are measured. Good video for instruction and review for any grade level.

Trigonometric Ratios of Special Angles


By AlRichards314

This video shows us how we determine the trigonometric ratios for the angles of 30 degrees, 45 degrees, and 60 degrees. Keep in mind that the ratios of the sides corresponding to these angles never change (even though the side lengths may change). That means that knowing the values for these trig ratios means you'll know them forever! They won't change!

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.

Geometry -- Lesson 4.3 -- Congruent Triangles


By MisterRutter

This geometry lesson explains congruent triangles: triangles with the same measure sides and angles.

Trigonometric Functions To Find Unknown Sides of Right Triangles, Ex 2


By PatrickJMT

Trigonometric Functions To Find Unknown Sides of Right Triangles, Ex 2. In this video, I use information about the length of the hypotenuse of a right triangle as well as a trig function to find the length of a missing side.