1.5 segment & angle bisectors geometry mrs. blanco
Post on 23-Dec-2015
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Standard/Objective
Standard 3: Students will understand geometric concepts and applications.
Objectives:
• Find the Midpoint of a segment.
• Bisect a segment.
• Bisect an angle.
Midpoint• The point on a segment that divides the
segment into two congruent segments. (bisects a segment)
1 2 1 2,2 2
x x y y
Ex 1a: Find the midpoint of CD if C(-12,-9) & D(2,10).
12 2 9 10,
2 2
10 1,
2 2
15,2
Ex 1b: You Try:
Find the Midpoint of CDC(-1.5,4) & D(0.25,-1).
Ex 2a: The midpoint of BD is M(-1,1). One endpoint is D(2,6).
Find the coordinates of B.
D
M B(-4,-4)
Ex 2b: You Try:Find the B if M(0,3) & D(-8,-1)
Angle BisectorAngle Bisector
• A ray that divides an angle into two adjacent angles that are congruent.
BD is an angle bisector of ABC.
B
A
C
D
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