Can you use the lengths of the sides of one figure to discover a missing length for a similar figure? Watch this video and find out. This video by Duane Habecker is part of the video collection at NextVista.org (http://nextvista.org), a proud partner... of Curriki.[more]

From YouTube, produced by Sal Khan of Khan Academy

Introduction to similar triangles. The instructor uses his computer (appears to be the Paint program) to communicate with the viewer. He uses different colors to aid in comprehension. For middle school students and older.

Video uses an electronic black board with different-colored pens. In this video. Mr. Khan discusses the measurement of alternate interior angles, corresponding angles and how they are similar. Triangles are drawn in two parallel lines and a transver...sal. Narrator shows how to figure out the length of the sides of the angles when three sides are known. Good quality video. Good for middle elementary and middle school students. (09:54)[more]

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 (S...ide-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. (04:31)[more]

Please make your comments on categories positive, and not just negative.

People work hard on educational categories, and we want to encourage them to make more!

Profanity (curse words), sexually suggestive remarks, and other such obviously inappropriate comments
will be deleted immediately, and are grounds for immediate expulsion. Remember, children use this website.

Personal criticism on project forums and in video content is not allowed and will be deleted immediately.
Any violations of this rule could result in expulsion from the project so please, no insults or other negative
personal remarks.

Very harshly-worded criticism of content will also be deleted promptly. Please use your vote to express your
harshest feelings. Repeated violations of this rule can result in expulsion. If you must criticize another
person's hard work, then be nice about it.

People work hard on educational categories, and we want to encourage them to make more!