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BC = 2√2
PΔABC = 15+2√2+(9+2√2) = 24 + 4√2 u
AΔABC = ABxBC/2 = 15x2√2/2 = 15√2 u²
5) ∠APB = 55/2
∠BRA = 55/2
∠APB + ∠BRA = 55°