1'5 Segment

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1.5 Segment Angle Bisectors

• p.34

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Always Remember!

• If they are congruent, then set their measures
  equal to each other!

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Midpoint

• The point that bisects a segment.
• Bisects?
• splits into 2 equal pieces

12x3 10x5
A M B
12x310x5 2x2 x1
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Segment Bisector

• A segment, ray, line, or plane that intersects a
  segment at its midpoint.

k
A
M
B
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Compass Straightedge

• Tools used for creating geometric constructions
• We will do a project with these later.

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Midpoint Formula

• Used for finding the coordinates of the midpoint
  of a segment in a coordinate plane.
• If the endpoints are (x1,y1) (x2,y2), then

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Ex Find the midpoint of SP if S(-3,-5) P(5,11).
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Ex The midpoint of AB is M(2,4). One endpoint
is A(-1,7). Find the coordinates of B.
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Angle Bisector

• A ray that divides an angle into 2 congruent
  adjacent angles.
• BD is an angle bisector of ltABC.

A
D
B
C
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Ex If FH bisects ltEFG mltEFG120o, what is
mltEFH?
E
H
F
G
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Last example Solve for x.
If they are congruent, set them equal to each
other, then solve!
x40o
x403x-20 402x-20 602x 30x
3x-20o
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Assignment