



Most
people know kind of what an angle is.



You can
see them at the point of a slice of pizza ... 











The
"lift" in a skateboard jump ramp ... 











and stuff
like that all have angles we know about. 





To get
really technical, 


if you
take two different rays that start at the same point 


you get
an angle ... 











There are
lots of ways to measure angles. 


The way
that gets used the most is called degrees. 





Why do
they call it degrees? 


Who
knows! 


And who
really cares? 





They
could have called it anything, 


degrees
is just a name. 





The
important thing is how it works. 





It works
kind of like a crazy watch that runs backwards. 





Example: 


Start
with a ray at 3 O'clock ... 











Now put
another ray at 12 O'clock. 











The angle
measure from the 3 O'clock ray 


to the 12
O'clock ray ... 











Now take
away the ray at 12 O'clock 


and put
in one at 9 O'clock ... 











There are
3 hours from 12 O'clock to 3 O'clock 


and 90
degrees. 


There are
6 hours from 9 O'clock to 3 O'clock. 


Guess how
many degrees it is? 











Now take
away the ray at 9 O'clock 


and put
one in at 6 O'clock. 





It's 9
hours from 6 O'clock to 3 O'clock 


How many
degrees do you think it is? 











How many
degrees do you think it would be from 12 O'clock 


back
around to 12 O'clock again? 





copyright 2005 Bruce Kirkpatrick 
