∡B = 180° - (80° + 40°) = 60°
AM = bisectoare => ∡BAM = ∡MAC = 80°/2 = 40°
(BM) = 2×∡BAM = 80°
(MC) = 2×∡MAC = 80°
BN = bisectoare => ∡ABN = ∡NBC = 60°/2 = 30°
(AN) = 2×∡ABN = 60°
(NC) = 2×∡NBC = 60°
CP = bisectoare => ∡ACP = ∡PCB = 40°/2 = 20°
(AP) = 2×∡ACP = 40°
(PB) = 2×∡PCB = 40°
