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< BAC + < ACB + < ABC = 180°
48° + 3p + 180° - 5p = 180°
-2p = - 48
p = 24°
semoga membantu ya :)
sudut B + 5p = 180°
substitusi:
180° - 5p = 180° - 3p - 48°
- 2p° = - 48°
p = 24°