



So
let's take some line segments



and build
shapes out of them. 





The most
simple shape we can build is a triangle. 











The
triangle is made of 3 line segments 


joined
end to end 


No matter
what any triangle looks like exactly, 


one thing
is always true. 





The
three angles on the inside of a triangle 


ALWAYS add up to 180
degrees. 











copyright 2005 Bruce Kirkpatrick 
