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• <br /> Calculation Procedure <br /> 17 Closed Shapes; <br /> 1 he geometric properties for closed shapes are computed by using the Polygon method, <br /> All closed shapes are represented by closed polygons. Curvilinea; and circular shapes or <br /> edges are represented by several straight line segments. The properties of the overall <br /> shape are computed by geometric summation of the properties of a trapezoid defined by <br /> projeraiun of two consecutive points of the cross-section on to the x and y axis. <br /> 2) Open Shapes; <br /> The geometric properties for open (thin walled)shapes are computed by using the Poiylirir <br /> method, Alt open shapes are represented by palylines. Curvilinear and circular shapes or <br /> edges are represented by several straight tine segments_The properties of the overall <br /> shape are computed by geometric summation of the properties of a line defined by <br /> protection of Iwo consecutive points of the cross-section on to the x and y axis <br /> For details refer to the User's Manual <br /> WELCOME RAMP CALCS-IBC 2018 Page 41 <br />