Sudut
180° - y = 41°
y = 180° - 41°
y = 139°
x = 180° - 41° = 139°
x = y = 139°
2y - x = 2x - x = x = 139°
Opsi : E
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Sudut
180° - y = 41°
y = 180° - 41°
y = 139°
x = 180° - 41° = 139°
x = y = 139°
2y - x = 2x - x = x = 139°
Opsi : E