Khan Academy: Triangles: Intro to Triangle Similarity

Explains the special relationship of the lengths of the sides of a 30-60-90 triangle using the Pythagorean theorem.

The Binomial theorem tells us how to expand expressions. The larger the power is, the harder it is to expand expressions like this directly. But with the Binomial theorem, the process is relatively fast! [13:15]

Solves an example problem in which the length of the hypotenuse is known and the length of a side must be determined. Explains the special relationship of the lengths of the sides of a 30-60-90 triangle using the Pythagorean theorem....

Video showing how to paramatrize a torus using two parameters by first visually showing the parameters without using equations. [19:02]

Video explains random variables, gives examples of what they are used for and explains the difference from traditional variables. Explains the difference between discrete and continuous random variables. Gives examples of using a random...

This video tutorial [8:35] identifies the parts of a right triangle and demonstrates how to use the Pythagorean Theorem to determine an unknown side length of a right triangle.

Explains how to prove that a radius is perpendicular to a chord that it bisects by using the side-side-side triangle congruence postulate. [8:19]

Review the triangle similarity criteria and use them to determine similar triangles.

Demonstrates how to use triangle congruency to prove that corresponding sides of congruent triangles are congruent and then identifies other congruent parts in the overlapping triangle diagram. The proof is written in the form of a...

Demonstrates how to use triangle congruency to prove that a given point is the midpoint of a given line segment. The proof is written in the form of a two-column proof. Practice problems available. [5:46]