Define Adjacent Angles:
Construct two intersecting line
segments, AB and CD.
Choose each segment and construct
"point at intersection", label as point E.
State the four sets of adjacent
angles that are formed.
is adjacent to and .
adjacent to and .
What can you conclude about and ?
These sets of angles are called
Define Vertical Angles:
can you conclude about and ?
These angles form a "linear pair".
Define a Linear Pair of
many sets of linear pairs are formed with two intersecting lines?
Construct a line segment AB.
Choose this segment and construct
"point on object", label as point C.
Construct line segment CD.
What can you conclude about the
sum of these two angles?
Move point D around the screen,
does your conclusion stay the same?
and are "supplementary angles".
a right angle ABC.
Construct a segment BD in
the interior of the angle.
Move point D around the
interior of the right angle, does your conclusion stay the same?
are "complementary angles".
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