One way to define a triangle.
_________ Worksheets to accompany The Fourier Transform and its Applications; Prof. Osgood, Stanford University: http://www.youtube.com/watch?v=gZNm7L96pfY [list] [*]Part I 1. Sine or cosine from two points: [url]http://www.geogebratube.org/material/show/id/49208[/url] 2. Unit Step, Unit Impulse: [url]http://www.geogebratube.org/material/show/id/49526[/url] [b]→3. Triangle function λ[/b] 4. Sum λ1+ λ2 is a scalene triangle: [url]http://www.geogebratube.org/material/show/id/50004[/url] [/list]