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3/9 × 180 = 60°
4/9 × 180 = 80°
total sudut segitiga pasti 180 derajat
jadi = 9x=180
x=180:9 = 20 derajat
2x = 2 x 20= 40
3x = 3 x 20 = 60
4x = 4 x 20 = 80