1. 1.4: Translating Angles and Angle Bisectors
WELCOME
Math 2
1.4: Translating Angles and Angle Bisectors
Last Night’s HW: 1.3 Handout
Tonight’s HW: 1.4 Handout
Quiz: Tomorrow ( )

2. Warm-Up Find the Midpoint of line segment AB, with endpoints:
Find the distance between point Z and point J
2) Z(11,-4) & J(-2,6)

3. Chapter 1 Section 4 J. I can translate an angle on a coordinate plane
K. I can construct a copy of an angle using my compass and straightedge
L. I can construct angle bisectors using my compass and straightedge
M. I know that an angle bisector splits an angle into two congruent angles.

4. Parts of an Angle
An angle consists of two different rays that share a common initial point B
Vertex
Sides C A
“ BAC, CAB, or A ”

5. Translating Angles

7. (we use matching red arcs to show congruency)
Angle Bisector
An angle bisector is a ray that divides an angle into two adjacent and congruent angles
Given BAC, B D C A
AD Bisects BAC if
m BAD = m DAC
(we use matching red arcs to show congruency)
BAD DAC

11. We measure angles using degrees(°)
We can match the sides of an angle with a number between 0 & 180 on the Protractor. B
70° C A
Measure of BCA equals the absolute value of the difference
“measure of C or m C ”

12. Practice