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use the 17" on your rafter square
A hip roof, or hipped roof, is a type of roof where all sides slope downwards to the walls, usually with a fairly gentle slope. A square hip roof is shaped like a pyramid. Hip roofs on rectangular houses will have two triangular sides and two trapezoidal ones. A hip roof on a rectangular plan has four faces.
For a gable end to gable end installation on 16" spacing you would need 34 trusses, 2 of which would be the gables. If your roof-line has hip ends or will be incorporated into an existing structure there will be more trusses.
Usually the best way is to simply build a new sloped roof onto the flat roof.
8’