no.6 sama 9 aja pake cara ya

6. x : y = 2 : 7
x/y = ²/₇
y = ⁷/₂ x

x + y = 180°
x + ⁷/₂ x = 180
⁹/₂ x = 180
x = 180 × ²/₉
x = 40°

9) ∠P₃ dan ∠Q₂