by applying the laws of right triangles. This type of solution therefore includes both a drawing and a calculation. Figure 4.7 shows the polygon for the situation at hand. The known side lengths (force magnitudes) and angles (force directions) are written on the diagram after the vectors have been drawn using the head-to-tail rule. The components Rx and Ry are found by analyzing the polygon's geometry. The equations for sum of the components become (with each term having the units of lb)