You are laying out an underground run of PVC to stub up into a wall at Point B as shown in Figure 105.1517. When the wall is built, it will intersect the concrete form at a right angle at Point C. The distance between Points C and B is 12 feet. The distance between Points A and C is 16 feet. To make certain that the PVC at Point B will stub up into the future wall, you lay out your tape measure between Points A and B. This distance should be ___ feet.
