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sudut B4 = 59°
sudut C1 = 180° - 59° = 121°
sudut D2 = 59°
4. sudut C = 180° - 125° = 55°
sudut ADC = 180° - (sudut A + sudut C)
(180° karena jumlah sudut segitiga 180°)
= 180° - (90° + 55°) = 180° - 145° = 35°
semoga membantu...maaf kalo belum ngerti bisa tanya lagi...soalnya susah ngejelasinnya