(a) subtract 100 from 180 then divide by two since the missing angles are equivalent.
(answer) a= 40°
(b) divide 180 by 5 (180= b + 2b + 2b which also equals to 180= 5b) and you'll get 36. Just plug it in to see if you're right (180= 36+ (2)36+ (2)36)
(answer) b= 36°
(c) you set each angle up to 120 like this (120= 3c + 2c or 120= 5c) which equals to 24.
(answer) c= 24°
(d) set 180 to all the a angles. (180= 6a or 180= 2a +2a +a +a) which ends up equaling to 30.
(answer) a= 30°
(e) 180= 6b, b= 30°
(answer) b= 30°
(f) 180- 90= 90
90= 5c
c= 18°
(answer) c= 18°
