Answer:
1. a=90; b=110
2. a=140
3. b=105
4. c=60
5. d=50
Step-by-step explanation:
For Problem 1, A can be found by adding up all the exterior angles and minus the final number by 360. The final number is 270, and 360-270=90, so a=90. To find b, you need to do 180-70=110, so b=110 Another way you could do it is get the original number as 360 and minus all the angles until you get the variable's angle.
For problem 2, you can do the same thing you did to find A in problem 1, which is 140.(360-120-100=140)
For problem 3, we can do the same as the problems before us, so b would be 105. (360-95-70-90=105)
For problem 4, we get c as 60 (360-55-55-90-100=60)
Problem 5 would be d=50 (360-70-70-70-60-40=50)
