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HW-1.3 Practice B
1-1 to 1-3 & Summer Packet Quiz FRIDAY
www.westex.org HS, Teacher Website
9-12-11
Warm up—Geometry CPA
1. Explain why any two right angles are congruent.
2. List the 4 ways this angle can be named.
A
B
1
C
GOAL:
I will be able to:
1. name and classify angles.
2. measure angles and angles that are bisected.
HW-1.3 Practice B
1-1 to 1-3 & Summer Packet Quiz FRIDAY
www.westex.org HS, Teacher Website
Name ______________________
Geometry CPA
1.3 Measuring Angles
Notes
An __________ is formed by two rays, or sides,
with a COMMON ENDPOINT called the
__________.
The set of all points BETWEEN the sides of the
angle is the _____________________________.
The set of all points OUTSIDE the angle is the
______________________________________.
EXAMPLE 1—Naming Angles
Name 3 DIFFERENT angles in the picture to the right.
___________
__________
__________
EXAMPLE 2—Measuring and Classifying Angles
Find the measure of each angle. Then classify each as
acute, right or obtuse.
a. BOA
b. DOB
c. EOC
Date _______
_________________________ are angles that have the
same measure. In the diagram, mABC = mDEF so
ABC  DEF. __________ are used to show that two
angles are congruent.
EXAMPLE 3—Using the Angle Addition Postulate
mDEG = 115°, and mDEF = 48°. Find mFEG.
YOU TRY:
(DRAW A PICTURE!!!)
K is in the interior of LMN, mLMK =52°, and mKMN = 12°. Find mLMN.
An _________________________ is a ray that divides an
angle into two congruent angles.
JK bisects LJM; thus LJK  KJM.
EXAMPLE 4—Finding the Measure of an Angle
KM bisects JKL, mJKM = (4x + 6)°, and
mMKL = (7x – 12)°. Find mJKM.
YOU TRY:
(DRAW A PICTURE!!!)
JK bisects LJM, mLJK = (-10x + 3)°, and
mKJM = (–x + 21)°. Find mLJM.