tolong ya... bantu saya

• 3a° + a° = 180
4a = 180
a =180/4
a = 45°
• 3b + b + 2b = 180
6b = 180
b =180/6
b=30°
• 30° + 3c + 45° =180
3c + 75° = 180
C = 180 -75 / 3
C = 105 /3
C = 35
• 4D + 60° + d = 180
5d = 180 - 60
d = 120 / 5
d = 24

•SUDUT ABD = 3A
= 3 . 45
=135°
•SUDUT DEH = 3B
=3 . 30
= 90
•SUDUT QRS = 3C + 45°
= 3 .35 + 45
= 105 + 45
= 150
•SUDUT KLN = 4D + 60
= 4 . 24 + 60
= 96 + 60
= 156