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penyiku sudut 105° = 180 - 105 = 75°
jumlah sudut segitiga = 180° => 180 - 60 - 75 = 45°
α = penyiku sudut 45° = 180 - 45 = 135°
b) penyiku sudut 120° = 180 - 120 = 60°
jumlah sudut segitiga = 180°
60 + 90 (siku2) + α = 180
α = 180 - 150 = 30°
penyiku sudut 105° = 180 - 105 = 75°
jumlah sudut segitiga = 180° => 180 - 60 - 75 = 45°
α = penyiku sudut 45° = 180 - 45 = 135°
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