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x = 20°
y = 40° (sudut dalam berseberangan)
y+z+80° = 180°
z = 180° - 80° - y
z = 100° - 40°
z = 60°
2) 10q = 100° (sudut dalam berseberangan)
q = 10°
4p + 10q = 180° (saling berpelurus)
4p = 180° - 10q
4p = 180° - 100°
4p = 80°
p = 20°
semoga membantu ya :)