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b = 4cm
c = 5cm
d - przekątna podstawy
D - przekątna prostopadłościanu
d² = a²+b²
d = √(a²+b²)
d = √(3*3+4*4)
d = √(9+16)
d = √25
d = 5 [cm]
D² = d²+c²
D = √(d²+c²)
D = √(5*5+5*5)
D = √(25+25)
D = √25*2
D = 5√2