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This page provides a list of educational videos related to Side and Angle Relationships of Triangles. You can also use this page to find sample questions, apps, worksheets, lessons , infographics and presentations related to Side and Angle Relationships of Triangles.
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
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.
Sine Values from Special Triangles
By outofmylaboratory
YouTube presents Sine Values from Special Triangles an educational video resources on math.
Trigonometric functions of special angles
By Khan Academy
Sal finds the trigonometric values of���������������������������/4.
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.
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.
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.
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)
