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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.
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.
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.
Inscribed Angles
By Wes Przybylski
This video provides a relatively quick lesson about inscribed angles and inscribed polygons. Uses diagrams to illustrate concepts.
Complementary and Supplementary angles - Sine and Cosine
By grant dempsey
Determine the relationship between sine and cosine of complementary angles
Complementary and Supplementary Angles - Example 1
By PatrickJMT
Complementary and Supplementary Angles - Example 1. In this video, I discuss what it means for angles to be complementary and supplementary and do a few problems where I find complements and supplements for different angles.
How to Apply Postulate 13 to Similar Triangles
By Khan Academy
Video uses an electronic black board with different colored pens. This video is an introduction to similar triangles. The person discusses the meaning of the term similar then goes on to discuss similar triangles (they have all the same angles), and why they are considered similar (ratio of corresponding sides is the same). Video then gives examples to help students understand the terms used and how to find similar angles. Good quality video. Good for middle elementary and middle school students.