No 4 dong pakai rumus nya... satu ini ajaa yaa
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90° + 30° + (x + y) = 180°
120° + (x + y) = 180°
(x + y) = 180° - 120°
(x + y) = 60°
jadi, y = 60° - x = 60° - 30° = 30°
y = 30°
perbandingan (x + y) dan y
(x + y) : y
60 : 30 => dibagi 30
2 : 1