CHS Properties of Triangular Arched Steel Roof Trusses

my name is Felix based in Nigeria. can anyone here to help me with the Circular Hollow Section (CHS) Properties of the Triangular Arched Space Steel Roof Trusses to Span 60 meters. Thanks so much and i would be very happy for your support and suggestion in dealing with this steel structures.
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Triangular Arched Trusses.jpg