The solutions for the next two examples are based on the use of geometric construction and trigonometric calculations. In general, the solution for linear dimensions can be approached by the construction of lines parallel to the linear dimension to be solved for: lines parallel to lines in the figure of the problem, lines connecting the centers of circles or arcs, and/or lines drawn perpendicular to known or constructed lines. When problems have rolls (circles) shown contacting two lines in a Vee construction, remember that a line drawn from the center of the circle to the vertex of the angle of the Vee bisects that angle. Also radii drawn to the point of tangency are perpendicular to that side of the Vee at the point of tangency.