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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, mABC = mDEF so ABC DEF. __________ are used to show that two angles are congruent. EXAMPLE 3—Using the Angle Addition Postulate mDEG = 115°, and mDEF = 48°. Find mFEG. YOU TRY: (DRAW A PICTURE!!!) K is in the interior of LMN, mLMK =52°, and mKMN = 12°. Find mLMN. 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, mJKM = (4x + 6)°, and mMKL = (7x – 12)°. Find mJKM. YOU TRY: (DRAW A PICTURE!!!) JK bisects LJM, mLJK = (-10x + 3)°, and mKJM = (–x + 21)°. Find mLJM.