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A° = (x - 12)°
AB sejajar dengan CD, dan AD = CB, maka:
D° = C°
A° = B°
Ingat bahwa total jumlah sudut segiempat pasti 360°. Jadi:
sudut A + sudut B + sudut C + sudut D = 360
(x - 12) + (x - 12) + (2x + 21) + (2x + 21) = 360
2(x - 12) + 2(2x + 21) = 360
2x - 24 + 4x + 42 = 360
6x + 18 = 360
6x = 342
x = 57
A = 57 - 12 = 45°
D = 2(57) + 21 = 135°