This is a catchy song about the hypotenuse of right triangles. It also has short lesson on the Pythagorean theorem at the end. Some other key vocabulary words include: obtuse, acute, 90 degrees, and Pythagoras. (03:35).

From pbslearningmedia.org, produced by Math Active

Compare attributes of two-dimensional shapes including, squares, rectangles, triangles, and circles. Identify the properties of two-dimensional figures using appropriate terminology.

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. (09:30)[more]

Video uses an electronic black board with different colored pens. Narrator reviews a 45-45-90 triangle and how to solve for the hypotenuse using the Pythagorean Theorem. Then narrator goes on to a 30-60-90 triangle, where one angle is 30 degrees, a...nother angle is 60 degrees and the last angle is 90 degrees. The length of the sides is the discussed and found. This video is for middle school students. (09:40)[more]

In this nine-minute video clip, Sal Khan, of Khan Academy, offers an example of a median centriod right triangle. For better viewing of the small print, open the video to 'full screen'. (08:59)

This video shows a drawing of two adjacent right triangles and stresses that using the shared side is key to solving problems involving adjacent right triangles. (03:19)

Students are asked to solve advanced problems using the 45°-45°-90° and 30°-60°-90° triangle formulas, such as finding the missing parts of a rhombus, a trapezoid, or an equilateral triangle. (04:12)

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