Transcript WARM-UP

WARM-UP: Classify each statement as true or false.
1.
2.
3.
4.
Plane Y and
intersect in point L. True
True
Points J, K, L and N are coplanar.
FALSE
Points J, L and Q are collinear.
Draw a vertical plane Z intersecting
a horizontal line m in a point T.
T
l
Z
HW #3:
p. 15-16, WEx. #2-26
even, 32-40 even
1-3 Segments, Rays, Distance
Segment AC
– denoted
– consists of points A and C and all points in between
– Points A and C are called endpoints of
Ray AC
– denoted
– consists of
and all other points P such that C is
between points A and P.
– Point A is called the endpoint of
and is stated 1st
and
are called opposite rays if point S is
between points R and T.
R
S
T
Ex. Hands on a clock are opposite rays.
Length:
– the distance between two points
– Segment length is found by subtracting the
coordinates of its endpoints.
– **The distance between two points is the
absolute value of the difference of their
coordinates.
Ex. Find the length of
.
= 4 – (–3) = 7
Segment Addition Postulate
If B is between A and C, then AB + BC = AC.
A
B
C
Ex. B is between A and C, with AB = x, BC = x + 6
and AC = 24. Find the value of x and the length
24
of BC.
A
B
x
C
x+6
Congruent—two objects that have the same size
and shape
Congruent segments—segments that have
equal lengths; e.g. DE FG
Midpoint of a segment—the point that divides
the segment into two congruent segments
Bisector of a segment—a line, segment, ray, or
plane that intersects the segment at its
midpoint.