In the final thesis we deal with determination of elastic modulus of a hanging elastic ring, which, deforms under self-weight. We first derive the main differential equation,which is solved by perturbation method for moderately large displacements and by 4th order Runge Kutta and shooting method for large displacements. We compare experimentally obtained points of the curve of a hanging ring to numerically calculated ones, and change the elastic modulus (unknown parameter) in the process to obtain the best match between the two methods. We calcutated the relative errors between the points of experimental and numerical curves and observe a relatively good match. We also compare the results of the approximative and numerical calculations.