  Event-shape variables, which are sensitive to perturbative and
nonperturbative aspects of quantum chromodynamic (QCD) interactions, are
studied in multijet events recorded in proton-proton collisions at sqrt(s) = 7
TeV. Events are selected with at least one jet with transverse momentum pt >
110 GeV and pseudorapidity abs(eta) < 2.4, in a data sample corresponding to
integrated luminosities of up to 5 inverse femtobarns. The distributions of
five event-shape variables in various leading jet pt ranges are compared to
predictions from different QCD Monte Carlo event generators.
