Geo 1­3 notes.notebook
September 04, 2009
Section 1‐3
distance
&
midpoints
Distance on:
Number Line:
AB =
or
CD =
Geo 1­3 notes.notebook
September 04, 2009
Coordinate Plane:
WHY?
B
PYTHAGOREAN THEOREM!!!
C
Geo 1­3 notes.notebook
September 04, 2009
Use the Pythagorean Theorem to find the distance between
X(7, 11) and Y(‐1, 5).
Definitions
Midpoint ­ The point halfway between the endpoints
Midpoint Formula
­ just the AVERAGE of each coordinate!
Geo 1­3 notes.notebook
September 04, 2009
Use the number line to find the coordinate of the midpoint of each segment.
RS
UV
Segment BISECTOR ­ ANYTHING that intersects a segment
at its midpoint
Geo 1­3 notes.notebook
September 04, 2009
Find the midpoint of RS.
Find the coordinates of the missing endpoint given that S is the
midpoint of RT.
S
T
Geo 1­3 notes.notebook
September 04, 2009
Find the coordinates of the missing endpoint given that S is the
midpoint of RT.
T
S
HOMEWORK
pages 17‐19 / 12‐36 every 4th
pages 25‐27 / 13‐39 odds, 43, 55