tolong bantu dg cepat Pakai cara nomor 6

Dik:
x : y = 2 : 7
x + y = 180 derajat

Dit:
Besar x?

Jawab:
[tex]x = \frac{2}{2 + 7} \times 180 \\ x = \frac{2}{9} \times 180 \\ x = 2 \times 20 \\ x = 40[/tex]

x:y=2:7
x=2÷9×180°
=40°