Chapter 1 Section 1.4

1. Chapter 1Section 1.4 Angles and Their Measures

2. B • Vertex Sides A • C Angle: Composed of two rays that have the same initial point Exterior Interior The angle can be named by BAC, CAB, or A

3. Name the 3 angles in the picture • PQS Top angle • SQR Bottom angle • PQR Whole angle

4. Congruence • Two angles are congruent if they have the same measure • If ABC  PQR then mABC = mPQR • Two segments are congruent if they have the same measure • Congruence: Having the same size and shape

5. Protractor Postulate • A protractor is used to measure angles • Angles are measured using Degrees

6. R • S • • P T Angle addition postulate RST • If P is in the interior of RST then • mRSP + mPST = m RST RSP PST

7. 4 angle types A A Acute Angle 0° < mA < 90 ° Right Angle mA = 90 ° • A A Straight Angle mA = 180 ° Obtuse Angle 90° < mA < 180 °

8. m TMF = m TMW + m WMF m TMF = 27 + 63 m TMF = 90 m XLV = m XLC + m CLV m  XLV = 39 + 103 m  XLV = 142

13. HW #5Pg 28: 1-39, 51-58, 64-73