Posted by GEOmetricity on October 10, 2002 at 12:35:57:
Take the following:
a \ b
---\---------->
d \ c
\
\
e \ f
--------\------>
g \ h
Corresponding angles are equal, 4 pairs of corresponding angles are formed.
a=e, b=f, d=g, c=h
However I now have this one here:
\
---\---------->
d \ c
\
\
e \ f
--------\------>
\
Alternate angles are equal
2 pairs of alternate angles are formed
d=f and c=e
I am fine with that as the imediate above is using only 2 pairs of angles....
Now this one..
\
---\---------->
d \ c
\
\
e \ f
--------\------>
\
Cointerior angles are supplementary
2 pairs of cointerior angles are formed
d+e = 180 degrees and c+f = 180 degrees
Now why wont d + c (or e + f) = 180 degrees??