3. Vertical AnglesSupplementary Angles Adjacent Angles

4. Angle A and B are complementary. Angle A is 63 ∘. What is angle B? 71o71o x x + 71 = 90 -71 -71 x = 19 o B + 63 = 90 -63 -63 B = 27 o

5. Angle C and D are supplementary. Angle C is 110 degrees. What is angle D? 75 X + 75 = 180 -75 - 75 x = 105 0 D + 110 = 180 - 110 -110

6. All angles in a triangle add up to 180 degrees. 50 4030 x + 50 +40 = 180 X + 90 = 180 - 90 -90 X = 90 0 x + 30 + 30 = 180 x + 60 = 180 - 60 -60 X = 120 o

7. All the angles in a quadrilateral add up to 360 degrees. 60 x115 60 x 120 60 x + 60 + 115+ 60 = 360 x + 235 = 360 - 235 -235 x =125 o x + 60 + 60 + 120 = 360 x + 240 = 360 - 240 -240 x = 120 o