(⌐■-■)(⌐■-■)(⌐■-■)(⌐■-■)
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R _|_ PQ => Triunghiul pqo dreptunghic , qop = 90°
PO(ipotenuză) = 13 cm ; PQ(catetă) = 12 cm } =>
OQ(raza) = \sqrt{169 - 144} = 5cm