A. Given: x Il y Find
1. a =
2. b =
3. c =
4. d=

ANSWER:
1. 35°
2. 35°
3. 145°
4. 90°
EXPLANATION:
1. a= 180° — 55° — 90° = 35°
2. as: ×|| y
so a=b = 35°
3. c = 180° — a = 145° the flat angle is 180°
4. d=90°