Rolling offsets are typically fabricated using 45° elbows therefore, the vertical angle will be 45°. The RISE is determined by subtracting the lower plane elevation from the upper plane elevation. Notice the SA of triangle 3 in Figure 13-28 is equal to the RUN of the box, the ROLL of the box is equal to the SO of triangle 3, and angle X of triangle 3 is the same as the horizontal angle (HOR°). When a rolling offset is part of a configuration similar to that shown in Figure 13-28, the lengths of the sides of triangle 3 are applied to the dimensions of the isometric box (see Figure 13-25). There are four length dimensions and two angular dimensions. Figure 13-25 identifies the six measurements required to dimension a rolling offset.
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