tolong ya besok dikumpul

1.
3a + a =180
4a = 180
a = 180/4
   = 45
3a = 3 x 45 = 135

b.
 b+b+b = 180
  3b = 180
    b = 180/3
       = 60


c.
3c+45+30 = 180
3c + 75 = 180
3c = 180 - 75
     = 105
c = 105/3
   = 35
3c+45 = 3 x 35 + 45 = 105 + 45 = 150

4.
4d + 60 + d = 180
5d + 60 = 180
5d = 180 - 60
     = 120
d = 120/5
   = 24
4d + 60 = 4 x 24 + 60 = 96 + 60 = 156







2.

a.
x = 35
y = 90 - 35 = 55

b. 
y = 62
x = 90 - 62 = 28