• A + B + C = 180
    2x + 3x + 40 = 180
    5x = 140
    x = 28
  • < A = 2x°
    < B = 3x°
    < C = 40°

    < A + < B + <C = 180°
    2x° + 3x° + 40° = 180°
    5x° + 40° = 180°
    5x° = 180° - 40°
    5x°= 140°
    x = 140°/5
    x = 28°

    Jadi nilai x yaitu 28°

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