In building bicycle frames or other constructions, which require high strength and low weight it is best to use building materials which are:A) Solid circular shaped rods made of steelB) Solid triangular shaped rods made from aluminium alloyC) Hollow circular shaped rods made from aluminium alloyD) Flat pressed iron or aluminium
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not A - this is not low weight B would not give as much strength as C, given the same weight not C - this does not give much strength So my answer would be C.
