angle is defined as: where two rays or two line segments join at a common
endpoint called the vertex. See part
1 for additional information.
angle measures less that 90° and can look something like these
(angles between the grey rays):
angle measures exactly 90° and will look something like this:
angle measures more than 90° but less than 180° and will look
something like these:
angle is 180°
angle is more than 180° but less than 360° and will look something
angles adding up to 90° are called complementary angles.
DBC are Complementary
angles adding up to 180° are called supplementary angles.
DBC are Supplementary
know the angle of
ABD, you can easily determine what the
DBC is by subtracting
ABD from 180!
On to Part