



We can
use the theorems we have talked about so far



to make
millions of others. 





The
problem is, the more you have 


the
harder it is to remember them all. 





Since all
of the others can be worked out 


from the
ones that we already have, 


it makes
sense to only learn a new one 


if you
use it a lot or need it for a test. 





Some
people can remember lots of theorems 


some
people have to look most of them up. 





If you
can only remember one, 


this is
the one to remember. 





The
Pythagorean Theorem 


If you
have a right triangle 


and you
multiply the length of the shorter sides times themselves 


and then
add those two numbers together 


you get
the same answer as you do 


when you
multiply the longer side times itself. 





We can
use this to test to see if we have a right triangle. 


We can
also use it to find the length of an unknown side 


if we
have the length of the other two 


and know
that we have a right triangle. 











With the
Pythagorean Theorem 


and the
similar triangle stuff from the last page, 


math
types were able to build all of Trigonometry ... 





copyright 2005 Bruce Kirkpatrick 
