CH - высота, AH =AB/4
ACH~ABC (прямоугольные, A - общий)
AH/AC = AC/AB => AB/4*12 = 12/AB <=> AB =24 (AB>0)
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CH - высота, AH =AB/4
ACH~ABC (прямоугольные, A - общий)
AH/AC = AC/AB => AB/4*12 = 12/AB <=> AB =24 (AB>0)