The planar spatial system is described in the introductory part of the final thesis. Types of systems of plane rods, types of connections between rods, degree of freedom, static indeterminacy and symmetry of the system itself are presented. Next, a statically determined task was given, for which the cross-section method was used to determine the internal forces and sketched diagrams on the shown planar spatial construction. Dimensioning was done by HMH theory using two cross-sections and two materials. After the strength conditions are met, the structure is clamped at its free end, and the resulting statically indeterminate structure is calculated using the force method. The method of forces is explained as a method of calculating statically indeterminate systems in which forces and moments are unknowns. Diagrams of internal forces were also determined for a statically indeterminate construction, and then a new dimensioning was carried out. At the very end, certain conclusions are reached in the form of material selection.