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180 = 4x + 3x+1 + 2x-1
180 = 9x
x = 20 derajat
semoga membantu :D
sudut 1 = 4x
sudut 2 = 3x+1
sudut 3 = 2x-1
jumlh sudut segitiga = 180
maka :
180 = 4x + 3x+1 + 2x-1
180 = 9x
x = 180/9
x = 20⁰