Home » browsing by Topic Categories
Space and Geometry »
Topic: Triangles
IWB Raw#1: Angle sum of a triangle
Using your Interactive Whiteboard to show the angle sum of triangle equals 180 degrees. Students can easily do this with their own triangles, so it makes a great lesson activity.
My Triangle, James Blunt on Sesame Street
Singer James Blunt, with Telly Monster, sings about his lost triangle.
NLVM Congruent Triangle Manipulative
Top quality Java app to explore triangle congruency conditions SSS, SAS, AAS and the problems with SSA. User has to build two triangles from given components and show the result has to be (or not in the case of SSA) congruent.
Pictorial Proofs of Euclid’s Elements
Full scan of Oliver Byrne’s 1847 masterpiece: Euclid’s Elements presented in colour pictogram style proofs (proofs with very few words). Pages can be used to give to students to decipher/explain – or as part of an exploration of the idea and history of mathematical proof. See for example http://www.math.ubc.ca/~cass/Euclid/book1/byrne-4.html