Tolong bantu nomor delapan pake cara ^_^

6. gambarnya gak jelas

7. 6x + (40+3x) + (30+x) = 180
    6x + 3x + x + 40 + 30 = 180
    10x + 70 = 180
    10x = 180 - 70
    10x = 110
      x = 11

8. sudut a = 1/2x, sudut b = 3/4x, sudut c = x

1/2x + 3/4x + x = 180
9/4x = 180
  x =80

sudut a = 1/2x              sudut c = x
          a = 40                           c = 80
sudut b = 3/4x
          b = 60