1. 1.4 Pairs of Angles Adjacent angles- two angles with a common vertex and common side. (Side by side) Linear pair- a pair of adjacent angles that make a straight line 3+ 4=180°

2. Types of Angles Complementary angles- two adjacent angles that add up to 90° Supplementary angles- two adjacent angles that add up to 180°

3. Types of Angles Vertical angles- opposite angles formed by two intersecting lines. Vertical angles are congruent. 1 and 3 are vertical angles 1  3 2 and 4 are vertical angles 2  4 1 2 3 4

4. Example What is the value of x in each problem? Ex1)Ex2) 8x + 13 + 27 = 180x + 15 + 83 = 180 27° (8x+13)° (x+15)° 83°

5. Example What is the value of x in each problem? Ex3)Ex2) 302+20+3x+1 = 3602x – 7 = 85 302° (3x+1)° (2x-7)° 85° 20°