Answer:
a1) 65
a2) 25
a3) 45
Step-by-step explanation:
all triangle equal to 180
65
25
45
1) green triangle 180 - 50 - 65 = 130 - 65 = 65
2) purple triangle 180 - 130 - 25 = 50 - 25 = 25
3) red triangle 180 - 45 - 90 = 90 - 45 = 45
