beserta caranya terima kasih :)

A4 = B2 ( dalam berseberangan), sehingga
2y + 6° = 126°
2y = 126° - 6°
2y = 120°
y = 60°
A1 + A4 = 180 ( sudut lurus)
(4x-6)+(2y + 6) = 180
4x - 6 +2y +6 = 180
4x +2y = 180
2x + y = 90
2x + 60 = 90
2x = 90 -30
2x = 30
x = 15
x + y = 15 + 60 = 75°....(C)

[tex]a1 + a4 = 180 \\ (4x - 6) + (2y + 6) = 180 \\ 4x + 2y = 180 \\ 2x + y = 90\\[/tex]
[tex]a4 = b2 \\ 2y + 6= 126 \\ 2y = 120 \\ y = 60\\[/tex]
[tex]2x + 60 = 90 \\ 2x = 30 \\ \times = 15[/tex]
[tex] {(x + y)}^{o} = {(15 + 60)}^{o} = {75}^{o} [/tex]